|A group of fire ants|
Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. Ants appear in the fossil record across the globe in considerable diversity during the latest Early Cretaceous and early Late Cretaceous, suggesting an earlier origin. Ants evolved from vespoid wasp ancestors in the Cretaceous period, and diversified after the rise of flowering plants. More than 12,500 of an estimated total of 22,000 species have been classified. They are easily identified by their elbowed antennae and the distinctive node-like structure that forms their slender waists.
Ants form colonies that range in size from a few dozen predatory individuals living in small natural cavities to highly organised colonies that may occupy large territories and consist of millions of individuals. Larger colonies consist of various castes of sterile, wingless females, most of which are workers (ergates), as well as soldiers (dinergates) and other specialised groups. Nearly all ant colonies also have some fertile males called "drones" (aner) and one or more fertile females called "queens" (gynes). The colonies are described as superorganisms because the ants appear to operate as a unified entity, collectively working together to support the colony.
Ants have colonised almost every landmass on Earth. The only places lacking indigenous ants are Antarctica and a few remote or inhospitable islands. Ants thrive in most ecosystems and may form 15–25% of the terrestrial animal biomass. Their success in so many environments has been attributed to their social organisation and their ability to modify habitats, tap resources, and defend themselves. Their long co-evolution with other species has led to mimetic, commensal, parasitic, and mutualistic relationships.
Ant societies have division of labour, communication between individuals, and an ability to solve complex problems. These parallels with human societies have long been an inspiration and subject of study. Many human cultures make use of ants in cuisine, medication, and rituals. Some species are valued in their role as biological pest control agents. Their ability to exploit resources may bring ants into conflict with humans, however, as they can damage crops and invade buildings. Some species, such as the red imported fire ant (Solenopsis invicta), are regarded as invasive species, establishing themselves in areas where they have been introduced accidentally.
The word ant and its chiefly dialectal form emmet come from ante, emete of Middle English, which come from ǣmette of Old English, and these are all related to the dialectal Dutch emt and the Old High German āmeiza, from which comes the modern German Ameise. All of these words come from West Germanic *ǣmaitjōn, and the original meaning of the word was "the biter" (from Proto-Germanic *ai-, "off, away" + *mait- "cut"). The family name Formicidae is derived from the Latin formīca ("ant") from which the words in other Romance languages, such as the Portuguese formiga, Italian formica, Spanish hormiga, Romanian furnică, and French fourmi are derived. It has been hypothesised that a Proto-Indo-European word *morwi- was used, cf. Sanskrit vamrah, Latin formīca, Greek μύρμηξ mýrmēx, Old Church Slavonic mraviji, Old Irish moirb, Old Norse maurr, Dutch mier.
Taxonomy and evolution
The family Formicidae belongs to the order Hymenoptera, which also includes sawflies, bees, and wasps. Ants evolved from a lineage within the stinging wasps, and a 2013 study suggests that they are a sister group of the Apoidea. In 1966, E. O. Wilson and his colleagues identified the fossil remains of an ant (Sphecomyrma) that lived in the Cretaceous period. The specimen, trapped in amber dating back to around 92 million years ago, has features found in some wasps, but not found in modern ants. Sphecomyrma was possibly a ground forager, while Haidomyrmex and Haidomyrmodes, related genera in subfamily Sphecomyrminae, are reconstructed as active arboreal predators. Older ants in the genus Sphecomyrmodes have been found in 99 million year-old amber from Myanmar. A 2006 study suggested that ants arose tens of millions of years earlier than previously thought, up to 168 million years ago. After the rise of flowering plants about 100 million years ago they diversified and assumed ecological dominance around 60 million years ago. Some groups, such as the Leptanillinae and Martialinae, are suggested to have diversified from early primitive ants that were likely to have been predators underneath the surface of the soil.
During the Cretaceous period, a few species of primitive ants ranged widely on the Laurasian supercontinent (the Northern Hemisphere). They were scarce in comparison to the populations of other insects, representing only about 1% of the entire insect population. Ants became dominant after adaptive radiation at the beginning of the Paleogene period. By the Oligocene and Miocene, ants had come to represent 20–40% of all insects found in major fossil deposits. Of the species that lived in the Eocene epoch, around one in 10 genera survive to the present. Genera surviving today comprise 56% of the genera in Baltic amber fossils (early Oligocene), and 92% of the genera in Dominican amber fossils (apparently early Miocene).
Termites live in colonies and are sometimes called ‘white ants’, but termites are not ants. They are the sub-order Isoptera, and together with cockroaches they form the order Blattodea. Blattodeans are related to mantids, crickets, and other winged insects that do not undergo full metamorphosis. Like ants, termites are eusocial, with sterile workers, but they differ greatly in the genetics of reproduction. The similarity of their social structure to that of ants is attributed to convergent evolution. Velvet ants look like large ants, but are wingless female wasps.
Distribution and diversity
Ants are found on all continents except Antarctica, and only a few large islands, such as Greenland, Iceland, parts of Polynesia and the Hawaiian Islands lack native ant species. Ants occupy a wide range of ecological niches and exploit many different food resources as direct or indirect herbivores, predators and scavengers. Most ant species are omnivorous generalists, but a few are specialist feeders. Their ecological dominance is demonstrated by their biomass: ants are estimated to contribute 15–20 % (on average and nearly 25% in the tropics) of terrestrial animal biomass, exceeding that of the vertebrates.
Ants range in size from 0.75 to 52 millimetres (0.030–2.0 in), the largest species being the fossil Titanomyrma giganteum, the queen of which was 6 centimetres (2.4 in) long with a wingspan of 15 centimetres (5.9 in). Ants vary in colour; most ants are red or black, but a few species are green and some tropical species have a metallic lustre. More than 12,000 species are currently known (with upper estimates of the potential existence of about 22,000) (see the article List of ant genera), with the greatest diversity in the tropics. Taxonomic studies continue to resolve the classification and systematics of ants. Online databases of ant species, including AntBase and the Hymenoptera Name Server, help to keep track of the known and newly described species. The relative ease with which ants may be sampled and studied in ecosystems has made them useful as indicator species in biodiversity studies.
Ants are distinct in their morphology from other insects in having elbowed antennae, metapleural glands, and a strong constriction of their second abdominal segment into a node-like petiole. The head, mesosoma, and metasoma are the three distinct body segments (formally tagmata). The petiole forms a narrow waist between their mesosoma (thorax plus the first abdominal segment, which is fused to it) and gaster (abdomen less the abdominal segments in the petiole). The petiole may be formed by one or two nodes (the second alone, or the second and third abdominal segments).
Like other insects, ants have an exoskeleton, an external covering that provides a protective casing around the body and a point of attachment for muscles, in contrast to the internal skeletons of humans and other vertebrates. Insects do not have lungs; oxygen and other gases, such as carbon dioxide, pass through their exoskeleton via tiny valves called spiracles. Insects also lack closed blood vessels; instead, they have a long, thin, perforated tube along the top of the body (called the "dorsal aorta") that functions like a heart, and pumps haemolymph toward the head, thus driving the circulation of the internal fluids. The nervous system consists of a ventral nerve cord that runs the length of the body, with several ganglia and branches along the way reaching into the extremities of the appendages.
An ant's head contains many sensory organs. Like most insects, ants have compound eyes made from numerous tiny lenses attached together. Ant eyes are good for acute movement detection, but do not offer a high resolution image. They also have three small ocelli (simple eyes) on the top of the head that detect light levels and polarization. Compared to vertebrates, ants tend to have blurrier eyesight, particularly in smaller species, and a few subterranean taxa are completely blind. However, some ants, such as Australia's bulldog ant, have excellent vision and are capable of discriminating the distance and size of objects moving nearly a metre away.
Two antennae ("feelers") are attached to the head; these organs detect chemicals, air currents, and vibrations; they also are used to transmit and receive signals through touch. The head has two strong jaws, the mandibles, used to carry food, manipulate objects, construct nests, and for defence. In some species, a small pocket (infrabuccal chamber) inside the mouth stores food, so it may be passed to other ants or their larvae.
Both the legs and wings of the ant are attached to the mesosoma ("thorax"). The legs terminate in a hooked claw which allows them to hook on and climb surfaces. Only reproductive ants, queens, and males, have wings. Queens shed their wings after the nuptial flight, leaving visible stubs, a distinguishing feature of queens. In a few species, wingless queens (ergatoids) and males occur.
The metasoma (the "abdomen") of the ant houses important internal organs, including those of the reproductive, respiratory (tracheae), and excretory systems. Workers of many species have their egg-laying structures modified into stings that are used for subduing prey and defending their nests.
In the colonies of a few ant species, there are physical castes—workers in distinct size-classes, called minor, median, and major ergates. Often, the larger ants have disproportionately larger heads, and correspondingly stronger mandibles. These are known as macrergates while smaller workers are known as micrergates. Although formally known as dinergates, such individuals are sometimes called "soldier" ants because their stronger mandibles make them more effective in fighting, although they still are workers and their "duties" typically do not vary greatly from the minor or median workers. In a few species, the median workers are absent, creating a sharp divide between the minors and majors. Weaver ants, for example, have a distinct bimodal size distribution. Some other species show continuous variation in the size of workers. The smallest and largest workers in Pheidologeton diversus show nearly a 500-fold difference in their dry-weights.
Workers cannot mate; however, because of the haplodiploid sex-determination system in ants, workers of a number of species can lay unfertilised eggs that become fully fertile, haploid males. The role of workers may change with their age and in some species, such as honeypot ants, young workers are fed until their gasters are distended, and act as living food storage vessels. These food storage workers are called repletes. For instance, these replete workers develop in the North American honeypot ant Myrmecocystus mexicanus. Usually the largest workers in the colony develop into repletes; and, if repletes are removed from the colony, other workers become repletes, demonstrating the flexibility of this particular polymorphism. This polymorphism in morphology and behaviour of workers initially was thought to be determined by environmental factors such as nutrition and hormones that led to different developmental paths; however, genetic differences between worker castes have been noted in Acromyrmex sp. These polymorphisms are caused by relatively small genetic changes; differences in a single gene of Solenopsis invicta can decide whether the colony will have single or multiple queens. The Australian jack jumper ant (Myrmecia pilosula) has only a single pair of chromosomes (with the males having just one chromosome as they are haploid), the lowest number known for any animal, making it an interesting subject for studies in the genetics and developmental biology of social insects.
The life of an ant starts from an egg; if the egg is fertilised, the progeny will be female diploid, if not, it will be male haploid. Ants develop by complete metamorphosis with the larva stages passing through a pupal stage before emerging as an adult. The larva is largely immobile and is fed and cared for by workers. Food is given to the larvae by trophallaxis, a process in which an ant regurgitates liquid food held in its crop. This is also how adults share food, stored in the "social stomach". Larvae, especially in the later stages, may also be provided solid food, such as trophic eggs, pieces of prey, and seeds brought by workers.
The larvae grow through a series of four or five moults and enter the pupal stage. The pupa has the appendages free and not fused to the body as in a butterfly pupa. The differentiation into queens and workers (which are both female), and different castes of workers, is influenced in some species by the nutrition the larvae obtain. Genetic influences and the control of gene expression by the developmental environment are complex and the determination of caste continues to be a subject of research. Winged male ants, called drones, emerge from pupae along with the usually winged breeding females. Some species, such as army ants, have wingless queens. Larvae and pupae need to be kept at fairly constant temperatures to ensure proper development, and so often are moved around among the various brood chambers within the colony.
A new ergate spends the first few days of its adult life caring for the queen and young. She then graduates to digging and other nest work, and later to defending the nest and foraging. These changes are sometimes fairly sudden, and define what are called temporal castes. An explanation for the sequence is suggested by the high casualties involved in foraging, making it an acceptable risk only for ants who are older and are likely to die soon of natural causes.
Ant colonies can be long-lived. The queens can live for up to 30 years, and workers live from 1 to 3 years. Males, however, are more transitory, being quite short-lived and surviving for only a few weeks. Ant queens are estimated to live 100 times as long as solitary insects of a similar size.
Ants are active all year long in the tropics, but, in cooler regions, they survive the winter in a state of dormancy known as hibernation. The forms of inactivity are varied and some temperate species have larvae going into the inactive state (diapause), while in others, the adults alone pass the winter in a state of reduced activity.
A wide range of reproductive strategies have been noted in ant species. Females of many species are known to be capable of reproducing asexually through thelytokous parthenogenesis. Secretions from the male accessory glands in some species can plug the female genital opening and prevent females from re-mating. Most ant species have a system in which only the queen and breeding females have the ability to mate. Contrary to popular belief, some ant nests have multiple queens, while others may exist without queens. Workers with the ability to reproduce are called "gamergates" and colonies that lack queens are then called gamergate colonies; colonies with queens are said to be queen-right.
Drones can also mate with existing queens by entering a foreign colony. When the drone is initially attacked by the workers, it releases a mating pheromone. If recognized as a mate, it will be carried to the queen to mate. Males may also patrol the nest and fight others by grabbing them with their mandibles, piercing their exoskeleton and then marking them with a pheromone. The marked male is interpreted as an invader by worker ants and is killed.
Most ants are univoltine, producing a new generation each year. During the species-specific breeding period, winged females and winged males, known to entomologists as alates, leave the colony in what is called a nuptial flight. The nuptial flight usually takes place in the late spring or early summer when the weather is hot and humid. Heat makes flying easier and freshly fallen rain makes the ground softer for mated queens to dig nests. Males typically take flight before the females. Males then use visual cues to find a common mating ground, for example, a landmark such as a pine tree to which other males in the area converge. Males secrete a mating pheromone that females follow. Males will mount females in the air, but the actual mating process usually takes place on the ground. Females of some species mate with just one male but in others they may mate with as many as ten or more different males, storing the sperm in their spermathecae.
Mated females then seek a suitable place to begin a colony. There, they break off their wings and begin to lay and care for eggs. The females can selectively fertilise future eggs with the sperm stored to produce diploid workers or lay unfertilized haploid eggs to produce drones. The first workers to hatch are known as nanitics, and are weaker and smaller than later workers, but they begin to serve the colony immediately. They enlarge the nest, forage for food, and care for the other eggs. Species that have multiple queens may have a queen leaving the nest along with some workers to found a colony at a new site, a process akin to swarming in honeybees.
Behaviour and ecology
Ants communicate with each other using pheromones, sounds, and touch. The use of pheromones as chemical signals is more developed in ants, such as the red harvester ant, than in other hymenopteran groups. Like other insects, ants perceive smells with their long, thin, and mobile antennae. The paired antennae provide information about the direction and intensity of scents. Since most ants live on the ground, they use the soil surface to leave pheromone trails that may be followed by other ants. In species that forage in groups, a forager that finds food marks a trail on the way back to the colony; this trail is followed by other ants, these ants then reinforce the trail when they head back with food to the colony. When the food source is exhausted, no new trails are marked by returning ants and the scent slowly dissipates. This behaviour helps ants deal with changes in their environment. For instance, when an established path to a food source is blocked by an obstacle, the foragers leave the path to explore new routes. If an ant is successful, it leaves a new trail marking the shortest route on its return. Successful trails are followed by more ants, reinforcing better routes and gradually identifying the best path.
Ants use pheromones for more than just making trails. A crushed ant emits an alarm pheromone that sends nearby ants into an attack frenzy and attracts more ants from farther away. Several ant species even use "propaganda pheromones" to confuse enemy ants and make them fight among themselves. Pheromones are produced by a wide range of structures including Dufour's glands, poison glands and glands on the hindgut, pygidium, rectum, sternum, and hind tibia. Pheromones also are exchanged, mixed with food, and passed by trophallaxis, transferring information within the colony. This allows other ants to detect what task group (e.g., foraging or nest maintenance) other colony members belong to. In ant species with queen castes, when the dominant queen stops producing a specific pheromone, workers begin to raise new queens in the colony.
Ants attack and defend themselves by biting and, in many species, by stinging, often injecting or spraying chemicals, such as formic acid in the case of formicine ants, alkaloids and piperidines in fire ants, and a variety of protein components in other ants. Bullet ants (Paraponera), located in Central and South America, are considered to have the most painful sting of any insect, although it is usually not fatal to humans. This sting is given the highest rating on the Schmidt sting pain index.
Trap-jaw ants of the genus Odontomachus are equipped with mandibles called trap-jaws, which snap shut faster than any other predatory appendages within the animal kingdom. One study of Odontomachus bauri recorded peak speeds of between 126 and 230 km/h (78 and 143 mph), with the jaws closing within 130 microseconds on average. The ants were also observed to use their jaws as a catapult to eject intruders or fling themselves backward to escape a threat. Before striking, the ant opens its mandibles extremely widely and locks them in this position by an internal mechanism. Energy is stored in a thick band of muscle and explosively released when triggered by the stimulation of sensory organs resembling hairs on the inside of the mandibles. The mandibles also permit slow and fine movements for other tasks. Trap-jaws also are seen in the following genera: Anochetus, Orectognathus, and Strumigenys, plus some members of the Dacetini tribe, which are viewed as examples of convergent evolution.
A Malaysian species of ant in the Camponotus cylindricus group has enlarged mandibular glands that extend into their gaster. If combat takes a turn for the worse, a worker may perform a final act of suicidal altruism by rupturing the membrane of its gaster, causing the content of its mandibular glands to burst from the anterior region of its head, spraying a poisonous, corrosive secretion containing acetophenones and other chemicals that immobilise small insect attackers. The worker subsequently dies.
Suicidal defences by workers are also noted in a Brazilian ant, Forelius pusillus, where a small group of ants leaves the security of the nest after sealing the entrance from the outside each evening.
In addition to defence against predators, ants need to protect their colonies from pathogens. Some worker ants maintain the hygiene of the colony and their activities include undertaking or necrophory, the disposal of dead nest-mates. Oleic acid has been identified as the compound released from dead ants that triggers necrophoric behaviour in Atta mexicana while workers of Linepithema humile react to the absence of characteristic chemicals (dolichodial and iridomyrmecin) present on the cuticle of their living nestmates to trigger similar behaviour.
Nests may be protected from physical threats such as flooding and overheating by elaborate nest architecture. Workers of Cataulacus muticus, an arboreal species that lives in plant hollows, respond to flooding by drinking water inside the nest, and excreting it outside. Camponotus anderseni, which nests in the cavities of wood in mangrove habitats, deals with submergence under water by switching to anaerobic respiration.
Many animals can learn behaviours by imitation, but ants may be the only group apart from mammals where interactive teaching has been observed. A knowledgeable forager of Temnothorax albipennis can lead a naïve nest-mate to newly discovered food by the process of tandem running. The follower obtains knowledge through its leading tutor. The leader is acutely sensitive to the progress of the follower and slows down when the follower lags and speeds up when the follower gets too close.
Controlled experiments with colonies of Cerapachys biroi suggest that an individual may choose nest roles based on her previous experience. An entire generation of identical workers was divided into two groups whose outcome in food foraging was controlled. One group was continually rewarded with prey, while it was made certain that the other failed. As a result, members of the successful group intensified their foraging attempts while the unsuccessful group ventured out fewer and fewer times. A month later, the successful foragers continued in their role while the others had moved to specialise in brood care.
Complex nests are built by many ant species, but other species are nomadic and do not build permanent structures. Ants may form subterranean nests or build them on trees. These nests may be found in the ground, under stones or logs, inside logs, hollow stems, or even acorns. The materials used for construction include soil and plant matter, and ants carefully select their nest sites; Temnothorax albipennis will avoid sites with dead ants, as these may indicate the presence of pests or disease. They are quick to abandon established nests at the first sign of threats.
The army ants of South America, such as the Eciton burchellii species, and the driver ants of Africa do not build permanent nests, but instead, alternate between nomadism and stages where the workers form a temporary nest (bivouac) from their own bodies, by holding each other together.
Weaver ant (Oecophylla spp.) workers build nests in trees by attaching leaves together, first pulling them together with bridges of workers and then inducing their larvae to produce silk as they are moved along the leaf edges. Similar forms of nest construction are seen in some species of Polyrhachis.
Formica polyctena, among other ant species, constructs nests that maintain a relatively constant interior temperature that aids in the development of larvae. The ants maintain the nest temperature by choosing the location, nest materials, controlling ventilation and maintaining the heat from solar radiation, worker activity and metabolism, and in some moist nests, microbial activity in the nest materials.
Some ant species, such as those that use natural cavities, can be opportunistic and make use of the controlled micro-climate provided inside human dwellings and other artificial structures to house their colonies and nest structures.
Cultivation of food
Most ants are generalist predators, scavengers, and indirect herbivores, but a few have evolved specialised ways of obtaining nutrition. It is believed that many ant species that engage in indirect herbivory rely on specialized symbiosis with their gut microbes  to upgrade the nutritional value of the food they collect  and allow them to survive in nitrogen poor regions, such as rainforest canopies. Leafcutter ants (Atta and Acromyrmex) feed exclusively on a fungus that grows only within their colonies. They continually collect leaves which are taken to the colony, cut into tiny pieces and placed in fungal gardens. Ergates specialise in related tasks according to their sizes. The largest ants cut stalks, smaller workers chew the leaves and the smallest tend the fungus. Leafcutter ants are sensitive enough to recognise the reaction of the fungus to different plant material, apparently detecting chemical signals from the fungus. If a particular type of leaf is found to be toxic to the fungus, the colony will no longer collect it. The ants feed on structures produced by the fungi called gongylidia. Symbiotic bacteria on the exterior surface of the ants produce antibiotics that kill bacteria introduced into the nest that may harm the fungi.
Foraging ants travel distances of up to 200 metres (700 ft) from their nest  and scent trails allow them to find their way back even in the dark. In hot and arid regions, day-foraging ants face death by desiccation, so the ability to find the shortest route back to the nest reduces that risk. Diurnal desert ants of the genus Cataglyphis such as the Sahara desert ant navigate by keeping track of direction as well as distance travelled. Distances travelled are measured using an internal pedometer that keeps count of the steps taken and also by evaluating the movement of objects in their visual field (optical flow). Directions are measured using the position of the sun. They integrate this information to find the shortest route back to their nest. Like all ants, they can also make use of visual landmarks when available as well as olfactory and tactile cues to navigate. Some species of ant are able to use the Earth's magnetic field for navigation. The compound eyes of ants have specialised cells that detect polarised light from the Sun, which is used to determine direction. These polarization detectors are sensitive in the ultraviolet region of the light spectrum. In some army ant species, a group of foragers who become separated from the main column may sometimes turn back on themselves and form a circular ant mill. The workers may then run around continuously until they die of exhaustion.
The female worker ants do not have wings and reproductive females lose their wings after their mating flights in order to begin their colonies. Therefore, unlike their wasp ancestors, most ants travel by walking. Some species are capable of leaping. For example, Jerdon's jumping ant (Harpegnathos saltator) is able to jump by synchronising the action of its mid and hind pairs of legs. There are several species of gliding ant including Cephalotes atratus; this may be a common trait among arboreal ants with small colonies. Ants with this ability are able to control their horizontal movement so as to catch tree trunks when they fall from atop the forest canopy.
Other species of ants can form chains to bridge gaps over water, underground, or through spaces in vegetation. Some species also form floating rafts that help them survive floods. These rafts may also have a role in allowing ants to colonise islands. Polyrhachis sokolova, a species of ant found in Australian mangrove swamps, can swim and live in underwater nests. Since they lack gills, they go to trapped pockets of air in the submerged nests to breathe.
Cooperation and competition
Not all ants have the same kind of societies. The Australian bulldog ants are among the biggest and most basal of ants. Like virtually all ants, they are eusocial, but their social behaviour is poorly developed compared to other species. Each individual hunts alone, using her large eyes instead of chemical senses to find prey.
Some species (such as Tetramorium caespitum) attack and take over neighbouring ant colonies. Others are less expansionist, but just as aggressive; they invade colonies to steal eggs or larvae, which they either eat or raise as workers or slaves. Extreme specialists among these slave-raiding ants, such as the Amazon ants, are incapable of feeding themselves and need captured workers to survive. Captured workers of enslaved Temnothorax species have evolved a counter strategy, destroying just the female pupae of the slave-making Temnothorax americanus, but sparing the males (who don't take part in slave-raiding as adults).
Ants identify kin and nestmates through their scent, which comes from hydrocarbon-laced secretions that coat their exoskeletons. If an ant is separated from its original colony, it will eventually lose the colony scent. Any ant that enters a colony without a matching scent will be attacked. Also, the reason why two separate colonies of ants will attack each other even if they are of the same species is because the genes responsible for pheromone production are different between them. The Argentine ant, however, does not have this characteristic, due to lack of genetic diversity, and has become a global pest because of it.
Parasitic ant species enter the colonies of host ants and establish themselves as social parasites; species such as Strumigenys xenos are entirely parasitic and do not have workers, but instead, rely on the food gathered by their Strumigenys perplexa hosts. This form of parasitism is seen across many ant genera, but the parasitic ant is usually a species that is closely related to its host. A variety of methods are employed to enter the nest of the host ant. A parasitic queen may enter the host nest before the first brood has hatched, establishing herself prior to development of a colony scent. Other species use pheromones to confuse the host ants or to trick them into carrying the parasitic queen into the nest. Some simply fight their way into the nest.
A conflict between the sexes of a species is seen in some species of ants with these reproducers apparently competing to produce offspring that are as closely related to them as possible. The most extreme form involves the production of clonal offspring. An extreme of sexual conflict is seen in Wasmannia auropunctata, where the queens produce diploid daughters by thelytokous parthenogenesis and males produce clones by a process whereby a diploid egg loses its maternal contribution to produce haploid males who are clones of the father.
Relationships with other organisms
Ants form symbiotic associations with a range of species, including other ant species, other insects, plants, and fungi. They also are preyed on by many animals and even certain fungi. Some arthropod species spend part of their lives within ant nests, either preying on ants, their larvae, and eggs, consuming the food stores of the ants, or avoiding predators. These inquilines may bear a close resemblance to ants. The nature of this ant mimicry (myrmecomorphy) varies, with some cases involving Batesian mimicry, where the mimic reduces the risk of predation. Others show Wasmannian mimicry, a form of mimicry seen only in inquilines.
Aphids and other hemipteran insects secrete a sweet liquid called honeydew, when they feed on plant sap. The sugars in honeydew are a high-energy food source, which many ant species collect. In some cases, the aphids secrete the honeydew in response to ants tapping them with their antennae. The ants in turn keep predators away from the aphids and will move them from one feeding location to another. When migrating to a new area, many colonies will take the aphids with them, to ensure a continued supply of honeydew. Ants also tend mealybugs to harvest their honeydew. Mealybugs may become a serious pest of pineapples if ants are present to protect mealybugs from their natural enemies.
Myrmecophilous (ant-loving) caterpillars of the butterfly family Lycaenidae (e.g., blues, coppers, or hairstreaks) are herded by the ants, led to feeding areas in the daytime, and brought inside the ants' nest at night. The caterpillars have a gland which secretes honeydew when the ants massage them. Some caterpillars produce vibrations and sounds that are perceived by the ants. A similar adaptation can be seen in Grizzled skipper butterflies that emit vibrations by expanding their wings in order to communicate with ants, which are natural predators of these butterflies. Other caterpillars have evolved from ant-loving to ant-eating: these myrmecophagous caterpillars secrete a pheromone that makes the ants act as if the caterpillar is one of their own larvae. The caterpillar is then taken into the ant nest where it feeds on the ant larvae. A number of specialized bacterial have been found as endosymbionts in ant guts. Some of the dominant bacteria belong to the order Rhizobiales whose members are known for being nitrogen-fixing symbionts in legumes but the species found in ant lack the ability to fix nitrogen. Fungus-growing ants that make up the tribe Attini, including leafcutter ants, cultivate certain species of fungus in the genera Leucoagaricus or Leucocoprinus of the family Agaricaceae. In this ant-fungus mutualism, both species depend on each other for survival. The ant Allomerus decemarticulatus has evolved a three-way association with the host plant, Hirtella physophora (Chrysobalanaceae), and a sticky fungus which is used to trap their insect prey.
Lemon ants make devil's gardens by killing surrounding plants with their stings and leaving a pure patch of lemon ant trees, (Duroia hirsuta). This modification of the forest provides the ants with more nesting sites inside the stems of the Duroia trees. Although some ants obtain nectar from flowers, pollination by ants is somewhat rare, one example being of the pollination of the orchid Leporella fimbriata which induces male Myrmecia urens to pseudocopulate with the flowers, transferring pollen in the process. One theory that has been proposed for the rarity of pollination is that the secretions of the metapleural gland inactivate and reduce the viability of pollen. Some plants have special nectar exuding structures, extrafloral nectaries, that provide food for ants, which in turn protect the plant from more damaging herbivorous insects. Species such as the bullhorn acacia (Acacia cornigera) in Central America have hollow thorns that house colonies of stinging ants (Pseudomyrmex ferruginea) who defend the tree against insects, browsing mammals, and epiphytic vines. Isotopic labelling studies suggest that plants also obtain nitrogen from the ants. In return, the ants obtain food from protein- and lipid-rich Beltian bodies. In Fiji Philidris nagasau (Dolichoderinae) are known to selectively grow species of epiphytic Squamellaria (Rubiaceae) which produce large domatia inside which the ant colonies nest. The ants plant the seeds and the domatia of young seedling are immediately occupied and the ant faeces in them contribute to rapid growth. Similar dispersal associations are found with other dolichoderines in the region as well. Another example of this type of ectosymbiosis comes from the Macaranga tree, which has stems adapted to house colonies of Crematogaster ants.
Many plant species have seeds that are adapted for dispersal by ants. Seed dispersal by ants or myrmecochory is widespread, and new estimates suggest that nearly 9% of all plant species may have such ant associations. Often, seed-dispersing ants perform directed dispersal, depositing the seeds in locations that increase the likelihood of seed survival to reproduction. Some plants in arid, fire-prone systems are particularly dependent on ants for their survival and dispersal as the seeds are transported to safety below the ground. Many ant-dispersed seeds have special external structures, elaiosomes, that are sought after by ants as food.
Most ants are predatory and some prey on and obtain food from other social insects including other ants. Some species specialise in preying on termites (Megaponera and Termitopone) while a few Cerapachyinae prey on other ants. Some termites, including Nasutitermes corniger, form associations with certain ant species to keep away predatory ant species. The tropical wasp Mischocyttarus drewseni coats the pedicel of its nest with an ant-repellent chemical. It is suggested that many tropical wasps may build their nests in trees and cover them to protect themselves from ants. Other wasps, such as A. multipicta, defend against ants by blasting them off the nest with bursts of wing buzzing. Stingless bees (Trigona and Melipona) use chemical defences against ants.
Flies in the Old World genus Bengalia (Calliphoridae) prey on ants and are kleptoparasites, snatching prey or brood from the mandibles of adult ants. Wingless and legless females of the Malaysian phorid fly (Vestigipoda myrmolarvoidea) live in the nests of ants of the genus Aenictus and are cared for by the ants.
Fungi in the genera Cordyceps and Ophiocordyceps infect ants. Ants react to their infection by climbing up plants and sinking their mandibles into plant tissue. The fungus kills the ants, grows on their remains, and produces a fruiting body. It appears that the fungus alters the behaviour of the ant to help disperse its spores  in a microhabitat that best suits the fungus. Strepsipteran parasites also manipulate their ant host to climb grass stems, to help the parasite find mates.
A nematode (Myrmeconema neotropicum) that infects canopy ants (Cephalotes atratus) causes the black-coloured gasters of workers to turn red. The parasite also alters the behaviour of the ant, causing them to carry their gasters high. The conspicuous red gasters are mistaken by birds for ripe fruits, such as Hyeronima alchorneoides, and eaten. The droppings of the bird are collected by other ants and fed to their young, leading to further spread of the nematode.
Army ants forage in a wide roving column, attacking any animals in that path that are unable to escape. In Central and South America, Eciton burchellii is the swarming ant most commonly attended by "ant-following" birds such as antbirds and woodcreepers. This behaviour was once considered mutualistic, but later studies found the birds to be parasitic. Direct kleptoparasitism (birds stealing food from the ants' grasp) is rare and has been noted in Inca doves which pick seeds at nest entrances as they are being transported by species of Pogonomyrmex. Birds that follow ants eat many prey insects and thus decrease the foraging success of ants. Birds indulge in a peculiar behaviour called anting that, as yet, is not fully understood. Here birds rest on ant nests, or pick and drop ants onto their wings and feathers; this may be a means to remove ectoparasites from the birds.
Anteaters, aardvarks, pangolins, echidnas and numbats have special adaptations for living on a diet of ants. These adaptations include long, sticky tongues to capture ants and strong claws to break into ant nests. Brown bears (Ursus arctos) have been found to feed on ants. About 12%, 16%, and 4% of their faecal volume in spring, summer, and autumn, respectively, is composed of ants.
Relationship with humans
Ants perform many ecological roles that are beneficial to humans, including the suppression of pest populations and aeration of the soil. The use of weaver ants in citrus cultivation in southern China is considered one of the oldest known applications of biological control. On the other hand, ants may become nuisances when they invade buildings, or cause economic losses.
In some parts of the world (mainly Africa and South America), large ants, especially army ants, are used as surgical sutures. The wound is pressed together and ants are applied along it. The ant seizes the edges of the wound in its mandibles and locks in place. The body is then cut off and the head and mandibles remain in place to close the wound. The large heads of the dinergates (soldiers) of the leafcutting ant Atta cephalotes are also used by native surgeons in closing wounds.
Some ants have toxic venom and are of medical importance. The species include Paraponera clavata (tocandira) and Dinoponera spp. (false tocandiras) of South America  and the Myrmecia ants of Australia.
In South Africa, ants are used to help harvest the seeds of rooibos (Aspalathus linearis), a plant used to make a herbal tea. The plant disperses its seeds widely, making manual collection difficult. Black ants collect and store these and other seeds in their nest, where humans can gather them en masse. Up to half a pound (200 g) of seeds may be collected from one ant-heap.
Although most ants survive attempts by humans to eradicate them, a few are highly endangered. These tend to be island species that have evolved specialized traits and risk being displaced by introduced ant species. Examples include the critically endangered Sri Lankan relict ant (Aneuretus simoni) and Adetomyrma venatrix of Madagascar.
It has been estimated by E.O. Wilson that the total number of individual ants alive in the world at any one time is between one and ten quadrillion (short scale) (i.e., between 1015 and 1016). According to this estimate, the total biomass of all the ants in the world is approximately equal to the total biomass of the entire human race. Also, according to this estimate, there are approximately 1 million ants for every human on Earth.
Ants and their larvae are eaten in different parts of the world. The eggs of two species of ants are used in Mexican escamoles. They are considered a form of insect caviar and can sell for as much as US$40 per pound ($90/kg) because they are seasonal and hard to find. In the Colombian department of Santander, hormigas culonas (roughly interpreted as "large-bottomed ants") Atta laevigata are toasted alive and eaten.
In areas of India, and throughout Burma and Thailand, a paste of the green weaver ant (Oecophylla smaragdina) is served as a condiment with curry. Weaver ant eggs and larvae, as well as the ants, may be used in a Thai salad, yam (Thai: ยำ), in a dish called yam khai mot daeng (Thai: ยำไข่มดแดง) or red ant egg salad, a dish that comes from the Issan or north-eastern region of Thailand. Saville-Kent, in the Naturalist in Australia wrote "Beauty, in the case of the green ant, is more than skin-deep. Their attractive, almost sweetmeat-like translucency possibly invited the first essays at their consumption by the human species". Mashed up in water, after the manner of lemon squash, "these ants form a pleasant acid drink which is held in high favor by the natives of North Queensland, and is even appreciated by many European palates".
In his First Summer in the Sierra, John Muir notes that the Digger Indians of California ate the tickling, acid gasters of the large jet-black carpenter ants. The Mexican Indians eat the replete workers, or living honey-pots, of the honey ant (Myrmecocystus).
Some ant species are considered as pests, primarily those that occur in human habitations, where their presence is often problematic. For example, the presence of ants would be undesirable in sterile places such as hospitals or kitchens. Some species or genera commonly categorized as pests include the Argentine ant, pavement ant, yellow crazy ant, banded sugar ant, pharaoh ant, red ant, carpenter ant, odorous house ant, red imported fire ant, and European fire ant. Some ants will raid stored food, some will seek water sources, others may damage indoor structures, some may damage agricultural crops directly (or by aiding sucking pests). Some will sting or bite. The adaptive nature of ant colonies make it nearly impossible to eliminate entire colonies and most pest management practices aim to control local populations and tend to be temporary solutions. Ant populations are managed by a combination of approaches that make use of chemical, biological, and physical methods. Chemical methods include the use of insecticidal bait which is gathered by ants as food and brought back to the nest where the poison is inadvertently spread to other colony members through trophallaxis. Management is based on the species and techniques may vary according to the location and circumstance.
In science and technology
Observed by humans since the dawn of history, the behaviour of ants has been documented and the subject of early writings and fables passed from one century to another. Those using scientific methods, myrmecologists, study ants in the laboratory and in their natural conditions. Their complex and variable social structures have made ants ideal model organisms. Ultraviolet vision was first discovered in ants by Sir John Lubbock in 1881. Studies on ants have tested hypotheses in ecology and sociobiology, and have been particularly important in examining the predictions of theories of kin selection and evolutionarily stable strategies. Ant colonies may be studied by rearing or temporarily maintaining them in formicaria, specially constructed glass framed enclosures. Individuals may be tracked for study by marking them with dots of colours.
The successful techniques used by ant colonies have been studied in computer science and robotics to produce distributed and fault-tolerant systems for solving problems, for example Ant colony optimization and Ant robotics. This area of biomimetics has led to studies of ant locomotion, search engines that make use of "foraging trails", fault-tolerant storage, and networking algorithms.
From the late 1950s through the late 1970s, ant farms were popular educational children's toys in the United States. Some later commercial versions use transparent gel instead of soil, allowing greater visibility at the cost of stressing the ants with unnatural light.
Anthropomorphised ants have often been used in fables and children's stories to represent industriousness and cooperative effort. They also are mentioned in religious texts. In the Book of Proverbs in the Bible, ants are held up as a good example for humans for their hard work and cooperation. Aesop did the same in his fable The Ant and the Grasshopper. In the Quran, Sulayman is said to have heard and understood an ant warning other ants to return home to avoid being accidentally crushed by Sulayman and his marching army.[Quran 27:18] In parts of Africa, ants are considered to be the messengers of the deities. Some Native American mythology, such as the Hopi mythology, considers ants as the very first animals. Ant bites are often said to have curative properties. The sting of some species of Pseudomyrmex is claimed to give fever relief. Ant bites are used in the initiation ceremonies of some Amazon Indian cultures as a test of endurance.
Ant society has always fascinated humans and has been written about both humorously and seriously. Mark Twain wrote about ants in his 1880 book A Tramp Abroad. Some modern authors have used the example of the ants to comment on the relationship between society and the individual. Examples are Robert Frost in his poem "Departmental" and T. H. White in his fantasy novel The Once and Future King. The plot in French entomologist and writer Bernard Werber's Les Fourmis science-fiction trilogy is divided between the worlds of ants and humans; ants and their behaviour is described using contemporary scientific knowledge. H.G. Wells wrote about intelligent ants destroying human settlements in Brazil and threatening human civilization in his 1905 science-fiction short story, The Empire of the Ants. In more recent times, animated cartoons and 3-D animated films featuring ants have been produced including Antz, A Bug's Life, The Ant Bully, The Ant and the Aardvark, Ferdy the Ant and Atom Ant. Renowned myrmecologist E. O. Wilson wrote a short story, "Trailhead" in 2010 for The New Yorker magazine, which describes the life and death of an ant-queen and the rise and fall of her colony, from an ants' point of view. The French neuroanatomist, psychiatrist and eugenicist Auguste Forel believed that ant societies were models for human society. He published a five volume work from 1921 to 1923 that examined ant biology and society.
Ants also are quite popular inspiration for many science-fiction insectoids, such as the Formics of Ender's Game, the Bugs of Starship Troopers, the giant ants in the films Them! and Empire of the Ants, Marvel Comics' super hero Ant-Man, and ants mutated into super-intelligence in Phase IV. In computer strategy games, ant-based species often benefit from increased production rates due to their single-minded focus, such as the Klackons in the Master of Orion series of games or the ChCht in Deadlock II. These characters are often credited with a hive mind, a common misconception about ant colonies.
- Ant robotics
- Ant venom
- Glossary of ant terms
- International Union for the Study of Social Insects
- Myrmecological News (journal)
- Task allocation and partitioning of social insects
- Moreau CS, Bell CD, Vila R, Archibald SB, Pierce NE (April 2006). "Phylogeny of the ants: diversification in the age of angiosperms". Science. 312 (5770): 101–4. Bibcode:2006Sci...312..101M. doi:10.1126/science.1124891. PMID 16601190.
- Ward, Philip S (2007). "Phylogeny, classification, and species-level taxonomy of ants (Hymenoptera: Formicidae)" (PDF). Zootaxa. 1668: 549–563. doi:10.11646/zootaxa.1668.1.26.
- Rabeling C, Brown JM, Verhaagh M (September 2008). "Newly discovered sister lineage sheds light on early ant evolution". Proceedings of the National Academy of Sciences of the United States of America. 105 (39): 14913–7. Bibcode:2008PNAS..10514913R. doi:10.1073/pnas.0806187105. PMC 2567467. PMID 18794530.
- Brady SG, Fisher BL, Schultz TR, Ward PS (May 2014). "The rise of army ants and their relatives: diversification of specialized predatory doryline ants". BMC Evolutionary Biology. 14: 93. doi:10.1186/1471-2148-14-93. PMC 4021219. PMID 24886136.
- "Hymenoptera name server. Formicidae species count". Ohio State University. Archived from the original on 2016-01-27.
- Agosti D, Johnson NF (2003). Fernández, F. (ed.). La nueva taxonomía de hormigas (PDF). Introducción a las hormigas de la región neotropical. Instituto Humboldt, Bogotá. pp. 45–48. Retrieved 2015-12-13.
- Fisher BL, Bolton B (26 July 2016). Ants of Africa and Madagascar: A Guide to the Genera. University of California Press. p. 24. ISBN 9780520290891.
- Singh R (2006). Elements of Entomology. Rastogi Publications. p. 284. ISBN 9788171336777.
- Oster GF, Wilson EO (1978). Caste and ecology in the social insects. Princeton University Press, Princeton. pp. 21–22. ISBN 978-0-691-02361-8. PMID 740003.
- Flannery T (2011). A Natural History of the Planet. Grove/Atlantic, Inc. p. 79. ISBN 978-0-8021-9560-9.
- Schultz TR (December 2000). "In search of ant ancestors". Proceedings of the National Academy of Sciences of the United States of America. 97 (26): 14028–9. Bibcode:2000PNAS...9714028S. doi:10.1073/pnas.011513798. PMC 34089. PMID 11106367.
- Hölldobler & Wilson (1990), p. 471
- Dicke E, Byde A, Cliff D, Layzell P (2004). A. J. Ispeert, M. Murata, N. Wakamiya (eds.). "An ant-inspired technique for storage area network design". Proceedings of Biologically Inspired Approaches to Advanced Information Technology: First International Workshop, BioADIT 2004 LNCS 3141: 364–379.
- Hölldobler & Wilson (1990), pp. 619–629
- "Pest Notes: Ants (Publication 7411)". University of California Agriculture and Natural Resources. 2007. Retrieved 5 June 2008.
- emmet. Merriam-Webster Dictionary
- "ant". Merriam-Webster Online Dictionary. Retrieved 6 June 2008.
- "Ant. Online Etymology Dictionary". Retrieved 30 May 2009.
- Simpson DP (1979). Cassell's Latin Dictionary (5 ed.). London: Cassell. ISBN 978-0-304-52257-6.
- "Formic". Etymonline.com. Retrieved 2012-01-30.
- Johnson BR, Borowiec ML, Chiu JC, Lee EK, Atallah J, Ward PS (October 2013). "Phylogenomics resolves evolutionary relationships among ants, bees, and wasps". Current Biology. 23 (20): 2058–62. doi:10.1016/j.cub.2013.08.050. PMID 24094856.
- Wilson EO, Carpenter FM, Brown WL (September 1967). "The first mesozoic ants". Science. 157 (3792): 1038–40. Bibcode:1967Sci...157.1038W. doi:10.1126/science.157.3792.1038. PMID 17770424.
- Perrichot V, Nel A, Néraudeau D, Lacau S, Guyot T (February 2008). "New fossil ants in French Cretaceous amber (Hymenoptera: Formicidae)". Die Naturwissenschaften. 95 (2): 91–7. Bibcode:2008NW.....95...91P. doi:10.1007/s00114-007-0302-7. PMID 17828384.
- Barden P, Grimaldi D (2014). "A diverse ant fauna from the mid-cretaceous of Myanmar (Hymenoptera: Formicidae)". PLOS One. 9 (4): e93627. Bibcode:2014PLoSO...993627B. doi:10.1371/journal.pone.0093627. PMC 3974876. PMID 24699881.
- Perrichot V, Lacau S, Néraudeau D, Nel A (February 2008). "Fossil evidence for the early ant evolution" (PDF). Die Naturwissenschaften. 95 (2): 85–90. Bibcode:2008NW.....95...85P. doi:10.1007/s00114-007-0301-8. PMID 17891532.
- Grimaldi D, Agosti D (December 2000). "A formicine in New Jersey cretaceous amber (Hymenoptera: formicidae) and early evolution of the ants". Proceedings of the National Academy of Sciences of the United States of America. 97 (25): 13678–83. Bibcode:2000PNAS...9713678G. doi:10.1073/pnas.240452097. PMC 17635. PMID 11078527.
- Wilson EO, Hölldobler B (May 2005). "The rise of the ants: a phylogenetic and ecological explanation". Proceedings of the National Academy of Sciences of the United States of America. 102 (21): 7411–4. Bibcode:2005PNAS..102.7411W. doi:10.1073/pnas.0502264102. PMC 1140440. PMID 15899976.
- LaPolla JS, Dlussky GM, Perrichot V (2013). "Ants and the fossil record". Annual Review of Entomology. 58: 609–30. doi:10.1146/annurev-ento-120710-100600. PMID 23317048.
- Barden P, Grimaldi D (2012). "Rediscovery of the bizarre Cretaceous ant Haidomyrmex Dlussky (Hymenoptera: Formicidae), with two new species" (PDF). American Museum Novitates. 3755 (3755): 1–16. doi:10.1206/3755.2. hdl:2246/6368.
- Hölldobler & Wilson (1990), pp. 23–24
- Thorne BL (1997). "Evolution of eusociality in termites" (PDF). Annu. Rev. Ecol. Syst. 28 (5): 27–53. doi:10.1146/annurev.ecolsys.28.1.27. PMC 349550. Archived from the original (PDF) on 2010-05-30.
- "Order Isoptera – Termites". Iowa State University Entomology. 16 February 2004. Archived from the original on 15 June 2008. Retrieved 12 June 2008.
- "Family Mutillidae – Velvet ants". Iowa State University Entomology. 16 February 2004. Archived from the original on 30 June 2008. Retrieved 12 June 2008.
- Hölldobler & Wilson (1990), p. 4
- Jones, Alice S. "Fantastic ants – Did you know?". National Geographic Magazine. Archived from the original on 30 July 2008. Retrieved 5 July 2008.
- Thomas, Philip (2007). "Pest Ants in Hawaii". Hawaiian Ecosystems at Risk project (HEAR). Retrieved 6 July 2008.
- Hölldobler & Wilson (1990), p. 589
- Shattuck SO (1999). Australian ants: their biology and identification. Collingwood, Vic: CSIRO. p. 149. ISBN 978-0-643-06659-5.
- Schaal, Stephan (27 January 2006). "Messel". Encyclopedia of Life Sciences. doi:10.1038/npg.els.0004143. ISBN 978-0-470-01617-6.
- Agosti D, Johnson NF, eds. (2005). "Antbase". American Museum of Natural History. Archived from the original on 11 August 2008. Retrieved 6 July 2008.
- Agosti D, Majer JD, Alonso JE, Schultz TR, eds. (2000). Ants: Standard methods for measuring and monitoring biodiversity. Smithsonian Institution Press. Retrieved 2015-12-13.
- Johnson NF (2007). "Hymenoptera name server". Ohio State University. Archived from the original on 27 January 2016. Retrieved 6 July 2008.
- Borror, Triplehorn & Delong (1989), p. 737
- Borror, Triplehorn & Delong (1989), pp. 24–71
- Fent K, Wehner R (April 1985). "Oceili: a celestial compass in the desert ant cataglyphis". Science. 228 (4696): 192–4. Bibcode:1985Sci...228..192F. doi:10.1126/science.228.4696.192. PMID 17779641.
- Palavalli-Nettimi, R.; Narendra, A. (2018). "Miniaturisation decreases visual navigational competence in ants". Journal of Experimental Biology. 221: jeb177238. doi:10.1242/jeb.177238.CS1 maint: multiple names: authors list (link)
- Eriksson ES (1985). "Attack behaviour and distance perception in the Australian bulldog ant Myrmecia nigriceps" (PDF). J. Exp. Biol. 119 (1): 115–131.
- Eisner T, Happ GM (1962). "The infrabuccal pocket of a formicine ant: a social filtration device". Psyche. 69 (3): 107–116. doi:10.1155/1962/25068.
- Holbrook, Tate. "Ask a Biologist: Face to Face with Ants". ASU School of Life Sciences. Retrieved 2018-01-23.
- Wilson EO (June 1953). "The origin and evolution of polymorphism in ants". The Quarterly Review of Biology. 28 (2): 136–56. doi:10.1086/399512. PMID 13074471.
- Weber, NA (1946). "Dimorphism in the African Oecophylla worker and an anomaly (Hym.: Formicidae)" (PDF). Annals of the Entomological Society of America. 39: 7–10. doi:10.1093/aesa/39.1.7.
- Wilson EO, Taylor RW (1964). "A Fossil Ant Colony: New Evidence of Social Antiquity" (PDF). Psyche. 71 (2): 93–103. doi:10.1155/1964/17612.
- Moffett MW, Tobin JE (1991). "Physical castes in ant workers: a problem for Daceton armigerum and other ants" (PDF). Psyche. 98 (4): 283–292. doi:10.1155/1991/30265. Archived from the original (PDF) on 2008-02-27.
- Børgesen LW (2000). "Nutritional function of replete workers in the pharaoh's ant, Monomorium pharaonis (L.)". Insectes Sociaux. 47 (2): 141–146. doi:10.1007/PL00001692.
- Rissing SW (1984). "Replete Caste Production and Allometry of Workers in the Honey Ant, Myrmecocystus mexicanus Wesmael (Hymenoptera: Formicidae)". Journal of the Kansas Entomological Society. 57 (2): 347–350.
- Hughes WO, Sumner S, Van Borm S, Boomsma JJ (August 2003). "Worker caste polymorphism has a genetic basis in Acromyrmex leaf-cutting ants". Proceedings of the National Academy of Sciences of the United States of America. 100 (16): 9394–7. Bibcode:2003PNAS..100.9394H. doi:10.1073/pnas.1633701100. PMC 170929. PMID 12878720.
- Ross KG, Krieger MJ, Shoemaker DD (December 2003). "Alternative genetic foundations for a key social polymorphism in fire ants". Genetics. 165 (4): 1853–67. PMC 1462884. PMID 14704171.
- Crosland MW, Crozier RH (March 1986). "Myrmecia pilosula, an Ant with Only One Pair of Chromosomes". Science. 231 (4743): 1278. Bibcode:1986Sci...231.1278C. doi:10.1126/science.231.4743.1278. PMID 17839565.
- Tsutsui ND, Suarez AV, Spagna JC, Johnston JS (February 2008). "The evolution of genome size in ants". BMC Evolutionary Biology. 8 (64): 64. doi:10.1186/1471-2148-8-64. PMC 2268675. PMID 18302783.
- Hölldobler, Bert; Wilson, Edward O. (1990). The Ants. Harvard University Press. p. 291. ISBN 978-0-674-04075-5.
- Gillott, Cedric (1995). Entomology. Springer. p. 325. ISBN 978-0-306-44967-3.
- Anderson KE, Linksvayer TA, Smith CR (2008). "The causes and consequences of genetic caste determination in ants (Hymenoptera: Formicidae)". Myrmecol. News. 11: 119–132.
- Hölldobler & Wilson (1990), pp. 351, 372
- Traniello JFA (1989). "Foraging strategies of ants". Annual Review of Entomology. 34: 191–210. doi:10.1146/annurev.en.34.010189.001203.
- Sorensen A, Busch TM, Vinson SB (1984). "Behavioral flexibility of temporal sub-castes in the fire ant, Solenopsis invicta, in response to food". Psyche. 91 (3–4): 319–332. doi:10.1155/1984/39236.
- Keller L (1998). "Queen lifespan and colony characteristics in ants and termites". Insectes Sociaux. 45 (3): 235–246. doi:10.1007/s000400050084.
- Franks NR, Resh VH, Cardé RT, eds. (2003). Encyclopedia of Insects. San Diego: Academic Press. pp. 29–32. ISBN 978-0-12-586990-4.
- Kipyatkov VE (2001). "Seasonal life cycles and the forms of dormancy in ants (Hymenoptera, Formicoidea)". Acta Societatis Zoologicae Bohemicae. 65 (2): 198–217.
- Heinze J, Tsuji K (1995). "Ant reproductive strategies" (PDF). Res. Popul. Ecol. 37 (2): 135–149. doi:10.1007/BF02515814.
- Mikheyev AS (2003). "Evidence for mating plugs in the fire ant Solenopsis invicta". Insectes Sociaux. 50 (4): 401–402. doi:10.1007/s00040-003-0697-x.
- Peeters C, Hölldobler B (November 1995). "Reproductive cooperation between queens and their mated workers: the complex life history of an ant with a valuable nest". Proceedings of the National Academy of Sciences of the United States of America. 92 (24): 10977–9. Bibcode:1995PNAS...9210977P. doi:10.1073/pnas.92.24.10977. PMC 40553. PMID 11607589.
- Franks NR, Hölldobler B (1987). "Sexual competition during colony reproduction in army ants". Biological Journal of the Linnean Society. 30 (3): 229–243. doi:10.1111/j.1095-8312.1987.tb00298.x.
- Yamauchi K, Kawase N (1992). "Pheromonal manipulation of workers by a fighting male to kill his rival males in the ant Cardiocondyla wroughtonii". Naturwissenschaften. 79 (6): 274–276. Bibcode:1992NW.....79..274Y. doi:10.1007/BF01175395.
- Taylor RW (2007). "Bloody funny wasps! Speculations on the evolution of eusociality in ants" (PDF). In Snelling RR, Fisher BL, Ward PS (eds.). Advances in ant systematics (Hymenoptera: Formicidae): homage to E. O. Wilson – 50 years of contributions. Memoirs of the American Entomological Institute, 80. American Entomological Institute. pp. 580–609. Retrieved 2015-12-13.
- Wilson EO (1957). "The organization of a nuptial flight of the ant Pheidole sitarches Wheeler" (PDF). Psyche. 64 (2): 46–50. doi:10.1155/1957/68319.
- Hölldobler & Wilson (1990), pp. 143–179
- Sudd JH, Franks NR (9 March 2013). The Behavioural Ecology of Ants. Springer Science & Business Media. p. 41. ISBN 9789400931237.
- Jackson DE, Ratnieks FL (August 2006). "Communication in ants". Current Biology. 16 (15): R570–4. doi:10.1016/j.cub.2006.07.015. PMID 16890508.
- Goss S, Aron S, Deneubourg JL, Pasteels JM (1989). "Self-organized shortcuts in the Argentine ant" (PDF). Naturwissenschaften. 76 (12): 579–581. Bibcode:1989NW.....76..579G. doi:10.1007/BF00462870.
- D'Ettorre P, Heinze J (2001). "Sociobiology of slave-making ants". Acta Ethologica. 3 (2): 67–82. doi:10.1007/s102110100038.
- Detrain C, Deneubourg JL, Pasteels JM (1999). Information processing in social insects. Birkhäuser. pp. 224–227. ISBN 978-3-7643-5792-4.
- Greene MJ, Gordon DM (March 2007). "Structural complexity of chemical recognition cues affects the perception of group membership in the ants Linephithema humile and Aphaenogaster cockerelli". The Journal of Experimental Biology. 210 (Pt 5): 897–905. doi:10.1242/jeb.02706. PMID 17297148.
- Hölldobler & Wilson (1990), p. 354
- Hickling R, Brown RL (October 2000). "Analysis of acoustic communication by ants". The Journal of the Acoustical Society of America. 108 (4): 1920–9. Bibcode:2000ASAJ..108.1920H. doi:10.1121/1.1290515. PMID 11051518.
- Roces F, Hölldobler B (1996). "Use of stridulation in foraging leaf-cutting ants: Mechanical support during cutting or short-range recruitment signal?". Behavioral Ecology and Sociobiology. 39 (5): 293–299. doi:10.1007/s002650050292.
- Schmidt, Justin O.; Blum, Murray S.; Overal, William L. (1983). "Hemolytic activities of stinging insect venoms". Archives of Insect Biochemistry and Physiology. 1 (2): 155–160. doi:10.1002/arch.940010205.
- Clarke PS (1986). "The natural history of sensitivity to jack jumper ants (Hymenoptera formicidae Myrmecia pilosula) in Tasmania". The Medical Journal of Australia. 145 (11–12): 564–6. doi:10.5694/j.1326-5377.1986.tb139498.x. PMID 3796365.
- Brown SG, Heddle RJ, Wiese MD, Blackman KE (August 2005). "Efficacy of ant venom immunotherapy and whole body extracts". The Journal of Allergy and Clinical Immunology. 116 (2): 464–5, author reply 465–6. doi:10.1016/j.jaci.2005.04.025. PMID 16083810.
- Obin MS, Vander Meer RK (December 1985). "Gaster flagging by fire ants (Solenopsis spp.): Functional significance of venom dispersal behavior". Journal of Chemical Ecology. 11 (12): 1757–68. doi:10.1007/BF01012125. PMID 24311339.
- Stafford CT (August 1996). "Hypersensitivity to fire ant venom". Annals of Allergy, Asthma & Immunology. 77 (2): 87–95, quiz 96–9. doi:10.1016/S1081-1206(10)63493-X. PMID 8760773.
- Patek SN, Baio JE, Fisher BL, Suarez AV (August 2006). "Multifunctionality and mechanical origins: ballistic jaw propulsion in trap-jaw ants". Proceedings of the National Academy of Sciences of the United States of America. 103 (34): 12787–92. Bibcode:2006PNAS..10312787P. doi:10.1073/pnas.0604290103. PMC 1568925. PMID 16924120.
- Gronenberg W (1996). "The trap-jaw mechanism in the Dacetine ant Daceton armigerum and Strumigenys sp" (PDF). The Journal of Experimental Biology. 199 (9): 2021–2033. PMID 9319931.
- Jones TH, Clark DA, Edwards AA, Davidson DW, Spande TF, Snelling RR (August 2004). "The chemistry of exploding ants, Camponotus spp. (cylindricus complex)". Journal of Chemical Ecology. 30 (8): 1479–92. doi:10.1023/B:JOEC.0000042063.01424.28. PMID 15537154.
- Tofilski A, Couvillon MJ, Evison SE, Helanterä H, Robinson EJ, Ratnieks FL (November 2008). "Preemptive defensive self-sacrifice by ant workers" (PDF). The American Naturalist. 172 (5): E239–43. doi:10.1086/591688. PMID 18928332.
- Julian GE, Cahan S (August 1999). "Undertaking specialization in the desert leaf-cutter ant Acromyrmex versicolor". Animal Behaviour. 58 (2): 437–442. doi:10.1006/anbe.1999.1184. PMID 10458895.
- López-Riquelme GO, Malo EA, Cruz-López L, Fanjul-Moles ML (2006). "Antennal olfactory sensitivity in response to task-related odours of three castes of the ant Atta mexicana (hymenoptera: formicidae)". Physiological Entomology. 31 (4): 353–360. doi:10.1111/j.1365-3032.2006.00526.x.
- Choe DH, Millar JG, Rust MK (May 2009). "Chemical signals associated with life inhibit necrophoresis in Argentine ants". Proceedings of the National Academy of Sciences of the United States of America. 106 (20): 8251–5. Bibcode:2009PNAS..106.8251C. doi:10.1073/pnas.0901270106. PMC 2688878. PMID 19416815.
- Tschinkel WR (2004). "The nest architecture of the Florida harvester ant, Pogonomyrmex badius". Journal of Insect Science. 4 (21): 21. doi:10.1093/jis/4.1.21. PMC 528881. PMID 15861237.
- Peeters C, Hölldobler B, Moffett M, Musthak Ali TM (1994). ""Wall-papering" and elaborate nest architecture in the ponerine ant Harpegnathos saltator". Insectes Sociaux. 41 (2): 211–218. doi:10.1007/BF01240479.
- Maschwitz U, Moog J (December 2000). "Communal peeing: a new mode of flood control in ants". Die Naturwissenschaften. 87 (12): 563–5. Bibcode:2000NW.....87..563M. doi:10.1007/s001140050780. PMID 11198200.
- Nielsen MG, Christian KA (May 2007). "The mangrove ant, Camponotus anderseni, switches to anaerobic respiration in response to elevated CO2 levels". Journal of Insect Physiology. 53 (5): 505–8. doi:10.1016/j.jinsphys.2007.02.002. PMID 17382956.
- Franks NR, Richardson T (January 2006). "Teaching in tandem-running ants". Nature. 439 (7073): 153. Bibcode:2006Natur.439..153F. doi:10.1038/439153a. PMID 16407943.
- Ravary F, Lecoutey E, Kaminski G, Châline N, Jaisson P (August 2007). "Individual experience alone can generate lasting division of labor in ants". Current Biology. 17 (15): 1308–12. doi:10.1016/j.cub.2007.06.047. PMID 17629482.
- Franks NR, Hooper J, Webb C, Dornhaus A (June 2005). "Tomb evaders: house-hunting hygiene in ants". Biology Letters. 1 (2): 190–2. doi:10.1098/rsbl.2005.0302. PMC 1626204. PMID 17148163.
- Hölldobler & Wilson (1990), p. 573
- Robson SK, Kohout RJ (2005). "Evolution of nest-weaving behaviour in arboreal nesting ants of the genus Polyrhachis Fr. Smith (Hymenoptera: Formicidae)". Australian Journal of Entomology. 44 (2): 164–169. doi:10.1111/j.1440-6055.2005.00462.x.
- Frouz J (2000). "The Effect of Nest Moisture on Daily Temperature Regime in the Nests of Formica polyctena Wood Ants". Insectes Sociaux. 47 (3): 229–235. doi:10.1007/PL00001708.
- Carpintero S, Reyes-López J, de Reynac LA (2004). "Impact of human dwellings on the distribution of the exotic Argentine ant: a case study in the Doñana National Park, Spain". Biological Conservation. 115 (2): 279–289. doi:10.1016/S0006-3207(03)00147-2.
- Friedrich R, Philpott SM (2009). "Nest-site Limitation and Nesting Resources of Ants (Hymenoptera: Formicidae) in Urban Green Spaces". Environmental Entomology. 38 (3): 600–607. doi:10.1603/022.038.0311. PMID 19508768.
- Anderson KE, Russell JA, Moreau CS, Kautz S, Sullam KE, Hu Y, Basinger U, Mott BM, Buck N, Wheeler DE (May 2012). "Highly similar microbial communities are shared among related and trophically similar ant species". Molecular Ecology. 21 (9): 2282–96. doi:10.1111/j.1365-294x.2011.05464.x. PMID 22276952.
- Feldhaar H, Straka J, Krischke M, Berthold K, Stoll S, Mueller MJ, Gross R (October 2007). "Nutritional upgrading for omnivorous carpenter ants by the endosymbiont Blochmannia". BMC Biology. 5: 48. doi:10.1186/1741-7007-5-48. PMC 2206011. PMID 17971224.
- Russell JA, Moreau CS, Goldman-Huertas B, Fujiwara M, Lohman DJ, Pierce NE (December 2009). "Bacterial gut symbionts are tightly linked with the evolution of herbivory in ants". Proceedings of the National Academy of Sciences of the United States of America. 106 (50): 21236–41. Bibcode:2009PNAS..10621236R. doi:10.1073/pnas.0907926106. PMC 2785723. PMID 19948964.
- Schultz TR (1999). "Ants, plants and antibiotics" (PDF). Nature. 398 (6730): 747–748. Bibcode:1999Natur.398..747S. doi:10.1038/19619.
- Carrol CR, Janzen DH (1973). "Ecology of foraging by ants". Annual Review of Ecology and Systematics. 4: 231–257. doi:10.1146/annurev.es.04.110173.001311.
- Wittlinger M, Wehner R, Wolf H (June 2006). "The ant odometer: stepping on stilts and stumps" (PDF). Science. 312 (5782): 1965–7. Bibcode:2006Sci...312.1965W. doi:10.1126/science.1126912. PMID 16809544. Archived from the original (PDF) on 2011-07-28.
- Ronacher B, Werner R (1995). "Desert ants Cataglyphis fortis use self-induced optic flow to measure distances travelled" (PDF). Journal of Comparative Physiology A. 177. doi:10.1007/BF00243395.
- Wehner R (August 2003). "Desert ant navigation: how miniature brains solve complex tasks" (PDF). Journal of Comparative Physiology A. 189 (8): 579–88. doi:10.1007/s00359-003-0431-1. PMID 12879352.
- Sommer S, Wehner R (January 2004). "The ant's estimation of distance travelled: experiments with desert ants, Cataglyphis fortis" (PDF). Journal of Comparative Physiology A. 190 (1): 1–6. doi:10.1007/s00359-003-0465-4. PMID 14614570.
- Åkesson S, Wehner R (2002). "Visual navigation in desert ants Cataglyphis fortis: are snapshots coupled to a celestial system of reference?" (PDF). Journal of Experimental Biology. 205 (14): 1971–1978.
- Steck K, Hansson BS, Knaden M (February 2009). "Smells like home: Desert ants, Cataglyphis fortis, use olfactory landmarks to pinpoint the nest" (PDF). Frontiers in Zoology. 6: 5. doi:10.1186/1742-9994-6-5. PMC 2651142. PMID 19250516.
- Seidl T, Wehner R (September 2006). "Visual and tactile learning of ground structures in desert ants" (PDF). The Journal of Experimental Biology. 209 (Pt 17): 3336–44. doi:10.1242/jeb.02364. PMID 16916970.
- Banks AN, Srygley RB (2003). "Orientation by magnetic field in leaf-cutter ants, Atta colombica (Hymenoptera: Formicidae)". Ethology. 109 (10): 835–846. doi:10.1046/j.0179-1613.2003.00927.x.
- Fukushi T (June 2001). "Homing in wood ants, Formica japonica: use of the skyline panorama". The Journal of Experimental Biology. 204 (Pt 12): 2063–72. PMID 11441048.
- Wehner R, Menzel R (April 1969). "Homing in the ant Cataglyphis bicolor". Science. 164 (3876): 192–4. Bibcode:1969Sci...164..192W. doi:10.1126/science.164.3876.192. PMID 5774195.
- Chapman RF (1998). The Insects: Structure and Function (4 ed.). Cambridge University Press. pp. 600. ISBN 978-0-521-57890-5.
- Delsuc F (November 2003). "Army ants trapped by their evolutionary history". PLOS Biology. 1 (2): E37. doi:10.1371/journal.pbio.0000037. PMC 261877. PMID 14624241.
- Baroni-Urbani C, Boyan GS, Blarer A, Billen J, Musthak Ali TM (1994). "A novel mechanism for jumping in the Indian ant Harpegnathos saltator (Jerdon) (Formicidae, Ponerinae)". Experientia. 50: 63–71. doi:10.1007/BF01992052.
- Yanoviak SP, Dudley R, Kaspari M (February 2005). "Directed aerial descent in canopy ants" (PDF). Nature. 433 (7026): 624–6. Bibcode:2005Natur.433..624Y. doi:10.1038/nature03254. PMID 15703745. Archived from the original (PDF) on 2007-06-16.
- Mlot NJ, Tovey CA, Hu DL (May 2011). "Fire ants self-assemble into waterproof rafts to survive floods". Proceedings of the National Academy of Sciences of the United States of America. 108 (19): 7669–73. Bibcode:2011PNAS..108.7669M. doi:10.1073/pnas.1016658108. PMC 3093451. PMID 21518911.
- Morrison LW (1998). "A review of Bahamian ant (Hymenoptera: Formicidae) biogeography". Journal of Biogeography. 25 (3): 561–571. doi:10.1046/j.1365-2699.1998.2530561.x.
- Clay RE, Andersen AN (1996). "Ant fauna of a mangrove community in the Australian seasonal tropics, with particular reference to zonation". Australian Journal of Zoology. 44 (5): 521–533. doi:10.1071/ZO9960521.
- Crosland MW, Crozier RH, Jefferson E (1988). "Aspects of the biology of the primitive ant genus Myrmecia F. (Hymenoptera: Formicidae)". Australian Journal of Entomology. 27 (4): 305–309. doi:10.1111/j.1440-6055.1988.tb01179.x.
- Diehl E, Junqueira LK, Berti-Filho E (2005). "Ant and termite mound coinhabitants in the wetlands of Santo Antonio da Patrulha, Rio Grande do Sul, Brazil". Brazilian Journal of Biology. 65 (3): 431–437. doi:10.1590/S1519-69842005000300008. PMID 16341421.
- Achenbach A, Foitzik S (April 2009). "First evidence for slave rebellion: enslaved ant workers systematically kill the brood of their social parasite protomognathus americanus". Evolution; International Journal of Organic Evolution. 63 (4): 1068–75. doi:10.1111/j.1558-5646.2009.00591.x. PMID 19243573. See also New Scientist, April 9, 2009
- Henderson G, Andersen JF, Phillips JK, Jeanne RL (July 1990). "Internest aggression and identification of possible nestmate discrimination pheromones in polygynous antFormica montana". Journal of Chemical Ecology. 16 (7): 2217–28. doi:10.1007/BF01026932. PMID 24264088.
- Ward PS (1996). "A new workerless social parasite in the ant genus Pseudomyrmex (Hymenoptera: Formicidae), with a discussion of the origin of social parasitism in ants". Systematic Entomology. 21 (3): 253–263. doi:10.1046/j.1365-3113.1996.d01-12.x.
- Taylor RW (1968). "The Australian workerless inquiline ant, Strumigenys xenos Brown (Hymenoptera-Formicidae) recorded from New Zealand". New Zealand Entomologist. 4 (1): 47–49. doi:10.1080/00779962.1968.9722888.
- Hölldobler & Wilson (1990), pp. 436–448
- Fournier D, Estoup A, Orivel J, Foucaud J, Jourdan H, Le Breton J, Keller L (June 2005). "Clonal reproduction by males and females in the little fire ant" (PDF). Nature. 435 (7046): 1230–4. Bibcode:2005Natur.435.1230F. doi:10.1038/nature03705. PMID 15988525.
- Reiskind J (1977). "Ant-mimicry in Panamanian clubionid and salticid spiders (Araneae: Clubionidae, Salticidae)". Biotropica. 9 (1): 1–8. doi:10.2307/2387854. JSTOR 2387854.
- Cushing PE (1997). "Myrmecomorphy and myrmecophily in spiders: A Review" (PDF). The Florida Entomologist. 80 (2): 165–193. doi:10.2307/3495552. JSTOR 3495552.
- Styrsky JD, Eubanks MD (January 2007). "Ecological consequences of interactions between ants and honeydew-producing insects". Proceedings. Biological Sciences. 274 (1607): 151–64. doi:10.1098/rspb.2006.3701. PMC 1685857. PMID 17148245.
- Jahn GC, Beardsley JW (1996). "Effects of Pheidole megacephala (Hymenoptera: Formicidae) on survival and dispersal of Dysmicoccus neobrevipes (Homoptera: Pseudococcidae)". Journal of Economic Entomology. 89 (5): 1124–1129. doi:10.1093/jee/89.5.1124.
- DeVries PJ (1992). "Singing caterpillars, ants and symbiosis". Scientific American. 267 (4): 76–82. Bibcode:1992SciAm.267d..76D. doi:10.1038/scientificamerican1092-76.
- Elfferich NW (1998). "Is the larval and imaginal signalling of Lycaenidae and other Lepidoptera related to communication with ants". Deinsea. 4 (1).
- Pierce NE, Braby MF, Heath A, Lohman DJ, Mathew J, Rand DB, Travassos MA (2002). "The ecology and evolution of ant association in the Lycaenidae (Lepidoptera)". Annual Review of Entomology. 47: 733–71. doi:10.1146/annurev.ento.47.091201.145257. PMID 11729090.
- Kautz S, Rubin BE, Russell JA, Moreau CS (January 2013). "Surveying the microbiome of ants: comparing 454 pyrosequencing with traditional methods to uncover bacterial diversity". Applied and Environmental Microbiology. 79 (2): 525–34. doi:10.1128/AEM.03107-12. PMC 3553759. PMID 23124239.
- Neuvonen MM, Tamarit D, Näslund K, Liebig J, Feldhaar H, Moran NA, Guy L, Andersson SG (December 2016). "The genome of Rhizobiales bacteria in predatory ants reveals urease gene functions but no genes for nitrogen fixation". Scientific Reports. 6 (1): 39197. Bibcode:2016NatSR...639197N. doi:10.1038/srep39197. PMC 5156944. PMID 27976703.
- Dejean A, Solano PJ, Ayroles J, Corbara B, Orivel J (April 2005). "Insect behaviour: arboreal ants build traps to capture prey". Nature. 434 (7036): 973. Bibcode:2005Natur.434..973D. doi:10.1038/434973a. PMID 15846335.
- Frederickson ME, Gordon DM (April 2007). "The devil to pay: a cost of mutualism with Myrmelachista schumanni ants in 'devil's gardens' is increased herbivory on Duroia hirsuta trees". Proceedings. Biological Sciences. 274 (1613): 1117–23. doi:10.1098/rspb.2006.0415. PMC 2124481. PMID 17301016.
- Peakall, R.; Beattie, A.J.; James, S.H. (1987). "Pseudocopulation of an orchid by male ants: a test of two hypotheses accounting for the rarity of ant pollination" (PDF). Oecologia. 73 (4): 522–524. Bibcode:1987Oecol..73..522P. doi:10.1007/BF00379410. PMID 28311968.
- Beattie AJ, Turnbull C, R B K, E G W (1984). "Ant Inhibition of Pollen Function: A Possible Reason Why Ant Pollination is Rare". American Journal of Botany. 71 (3): 421–426. doi:10.2307/2443499. JSTOR 2443499.
- New, Tim R. (2017), "Classic Themes: Ants, Plants and Fungi", Mutualisms and Insect Conservation, Springer International Publishing, pp. 63–103, doi:10.1007/978-3-319-58292-4_4, ISBN 9783319582917
- Katayama N, Suzuki N (2004). "Role of extrafloral nectaries of Vicia faba in attraction of ants and herbivore exclusion by ants". Entomological Science. 7 (2): 119–124. doi:10.1111/j.1479-8298.2004.00057.x.
- Fischer RC, Wanek W, Richter A, Mayer V (2003). "Do ants feed plants? A 15N labelling study of nitrogen fluxes from ants to plants in the mutualism of Pheidole and Piper". Journal of Ecology. 91: 126–134. doi:10.1046/j.1365-2745.2003.00747.x.
- Chomicki G, Renner SS (November 2016). "Obligate plant farming by a specialized ant". Nature Plants. 2 (12): 16181. doi:10.1038/nplants.2016.181. PMID 27869787.
- Chomicki G, Janda M, Renner SS (March 2017). "The assembly of ant-farmed gardens: mutualism specialization following host broadening". Proceedings. Biological Sciences. 284 (1850): 20161759. doi:10.1098/rspb.2016.1759. PMC 5360912. PMID 28298344.
- Fiala B, Maschwitz U, Pong TY, Helbig AJ (June 1989). "Studies of a South East Asian ant-plant association: protection of Macaranga trees by Crematogaster borneensis". Oecologia. 79 (4): 463–470. Bibcode:1989Oecol..79..463F. doi:10.1007/bf00378662. PMID 28313479.
- Lengyel S, Gove AD, Latimer AM, Majer JD, Dunn RR (2010). "Convergent evolution of seed dispersal by ants, and phylogeny and biogeography in flowering plants: A global survey". Perspectives in Plant Ecology, Evolution and Systematics. 12: 43–55. doi:10.1016/j.ppees.2009.08.001.
- Giladi I (2006). "Choosing benefits or partners: a review of the evidence for the evolution of myrmecochory". Oikos. 112 (3): 481–492. CiteSeerX 10.1.1.530.1306. doi:10.1111/j.0030-1299.2006.14258.x.
- Hanzawa FM, Beattie AJ, Culver DC (1988). "Directed dispersal: demographic analysis of an ant-seed mutualism". American Naturalist. 131 (1): 1–13. doi:10.1086/284769.
- Auld TD (1996). "Ecology of the Fabaceae in the Sydney region: fire, ants and the soil seedbank". Cunninghamia. 4 (22).
- Fischer RC, Ölzant SM, Wanek W, Mayer V (2005). "The fate of Corydalis cava elaiosomes within an ant colony of Myrmica rubra: elaiosomes are preferentially fed to larvae". Insectes Sociaux. 52 (1): 55–62. doi:10.1007/s00040-004-0773-x.
- Hughes L, Westoby M (1992). "Capitula on stick insect eggs and elaiosomes on seeds: convergent adaptations for burial by ants". Functional Ecology. 6 (6): 642–648. doi:10.2307/2389958. JSTOR 2389958.
- Quinet Y, Tekule N, de Biseau JC (2005). "Behavioural Interactions Between Crematogaster brevispinosa rochai Forel (Hymenoptera: Formicidae) and Two Nasutitermes Species (Isoptera: Termitidae)". Journal of Insect Behavior. 18 (1): 1–17. doi:10.1007/s10905-005-9343-y.
- Jeanne RL (1972). "Social biology of the neotropical wasp Mischocyttarus drewseni". Bull. Mus. Comp. Zool. 144: 63–150.
- Jeanne R (July 1995). "Foraging in Social Wasps: Agelaia lacks recruitment to food (Hymenoptera: Vespidae)". Journal of the Kansas Entomological Society.
- Sivinski J, Marshall S, Petersson E (1999). "Kleptoparasitism and phoresy in the Diptera" (PDF). Florida Entomologist. 82 (2): 179–197. doi:10.2307/3496570. JSTOR 3496570.
- Schaechter E (2000). "Some weird and wonderful fungi". Microbiology Today. 27 (3): 116–117.
- Andersen SB, Gerritsma S, Yusah KM, Mayntz D, Hywel-Jones NL, Billen J, Boomsma JJ, Hughes DP (September 2009). "The life of a dead ant: the expression of an adaptive extended phenotype" (PDF). The American Naturalist. 174 (3): 424–33. doi:10.1086/603640. PMID 19627240.
- Wojcik DP (1989). "Behavioral interactions between ants and their parasites" (PDF). The Florida Entomologist. 72 (1): 43–51. doi:10.2307/3494966. JSTOR 3494966. Retrieved 2017-10-25.
- Poinar G, Yanoviak SP (2008). "Myrmeconema neotropicum n. g., n. sp., a new tetradonematid nematode parasitising South American populations of Cephalotes atratus (Hymenoptera: Formicidae), with the discovery of an apparent parasite-induced host morph". Systematic Parasitology. 69 (2): 145–53. doi:10.1007/s11230-007-9125-3. PMID 18038201.
- Caldwell JP (1996). "The evolution of myrmecophagy and its correlates in poison frogs (Family Dendrobatidae)". Journal of Zoology. 240 (1): 75–101. doi:10.1111/j.1469-7998.1996.tb05487.x.
- Willis E, Oniki Y (1978). "Birds and Army Ants". Annual Review of Ecology and Systematics. 9: 243–263. doi:10.1146/annurev.es.09.110178.001331.
- Vellely AC (2001). "Foraging at army ant swarms by fifty bird species in the highlands of Costa Rica" (PDF). Ornitologia Neotropical. 12: 271–275. Retrieved 8 June 2008.
- Inzunza ER, Martínez-Leyva JE, Valenzuela-González JE (2015). "Doves kleptoparasitize ants". The Southwestern Naturalist. 60 (1): 103–106. doi:10.1894/msh-03.1.
- Wrege PH, Wikelski M, Mandel JT, Rassweiler T, Couzin ID (2005). "Antbirds parasitize foraging army ants". Ecology. 86 (3): 555–559. doi:10.1890/04-1133.
- Swenson JE, Jansson A, Riig R, Sandegren R (1999). "Bears and ants: myrmecophagy by brown bears in central Scandinavia". Canadian Journal of Zoology. 77 (4): 551–561. doi:10.1139/cjz-77-4-551.
- Gottrup F, Leaper D (2004). "Wound healing: Historical aspects" (PDF). EWMA Journal. 4 (2): 5. Archived from the original (PDF) on 2007-06-16.
- Gudger EW (1925). "Stitching wounds with the mandibles of ants and beetles". Journal of the American Medical Association. 84 (24): 1861–1864. doi:10.1001/jama.1925.02660500069048.
- Sapolsky RM (2001). A Primate's Memoir: A Neuroscientist's Unconventional Life Among the Baboons. Simon and Schuster. pp. 156. ISBN 978-0-7432-0241-1.
- Wheeler WM (1910). . Columbia University Biological Series. 9. Columbia University Press. p. 10. doi:10.5962/bhl.title.1937. ISBN 978-0-231-00121-2. LCCN 10008253//r88. OCLC 560205.
- Haddad V, Cardoso JL, Moraes RH (2005). "Description of an injury in a human caused by a false tocandira (Dinoponera gigantea, Perty, 1833) with a revision on folkloric, pharmacological and clinical aspects of the giant ants of the genera Paraponera and Dinoponera (sub-family Ponerinae)". Revista do Instituto de Medicina Tropical de São Paulo. 47 (4): 235–238. doi:10.1590/S0036-46652005000400012. PMID 16138209.
- McGain F, Winkel KD (August 2002). "Ant sting mortality in Australia". Toxicon. 40 (8): 1095–100. doi:10.1016/S0041-0101(02)00097-1. PMID 12165310.
- Downes D, Laird SA (1999). "Innovative mechanisms for sharing benefits of biodiversity and related knowledge" (PDF). The Center for International Environmental Law. Archived (PDF) from the original on 23 April 2008. Retrieved 8 June 2008.
- Cheney RH, Scholtz E (1963). "Rooibos tea, a South African contribution to world beverages". Economic Botany. 17 (3): 186–194. doi:10.1007/BF02859435.
- Chapman RE, Bourke AF (2001). "The influence of sociality on the conservation biology of social insects". Ecology Letters. 4 (6): 650–662. doi:10.1046/j.1461-0248.2001.00253.x.
- Holldobler B, Wilson EO (2009). The Superorganism: The Beauty, Elegance, and Strangeness of Insect Societies. New York: W. W. Norton. p. 5. ISBN 978-0-393-06704-0.
- "How many ants are there for every one person on earth?". info.com. Archived from the original on 13 August 2013. Retrieved 27 July 2013.
- DeFoliart GR (1999). "Insects as food: why the western attitude is important". Annual Review of Entomology. 44: 21–50. doi:10.1146/annurev.ento.44.1.21. PMID 9990715.
- Bingham CT (1903). Fauna of British India. Hymenoptera Volume 3. p. 311.
- Bequaert J (1921). "Insects as food: How they have augmented the food supply of mankind in early and recent times". Natural History Journal. 21: 191–200.
- Lubbock J (1881). "Observations on ants, bees, and wasps. IX. Color of flowers as an attraction to bees: Experiments and considerations thereon". J. Linn. Soc. Lond. (Zool.). 16 (90): 110–112. doi:10.1111/j.1096-3642.1882.tb02275.x.
- Stadler B, Dixon AF (2008). Mutualism: Ants and their insect partners. Cambridge University Press. ISBN 978-0-521-86035-2.
- Kennedy CH (1951). "Myrmecological technique. IV. Collecting ants by rearing pupae". The Ohio Journal of Science. 51 (1): 17–20. hdl:1811/3802.
- Wojcik DP, Burges RJ, Blanton CM, Focks DA (2000). "An improved and quantified technique for marking individual fire ants (Hymenoptera: Formicidae)" (PDF). The Florida Entomologist. 83 (1): 74–78. doi:10.2307/3496231. JSTOR 3496231.
- US granted 5803014, Guri A, "Habitat media for ants and other invertebrates", issued 8 September 1998, assigned to Plant Cell Technology Inc
- "The Ant, The Ants". Quran. Surah 27. pp. 18–19. Archived from the original on 2007-01-01.
- Bukhari S. "Beginning of Creation". Sunnah. 4 Book 54. Archived from the original on 2000-08-18.
- See wikisource:Bible_(World_English)/Proverbs#30:25
- Deen MY (1990). "Islamic Environmental Ethics, Law, and Society" (PDF). In Engel JR, JG Engel (eds.). Ethics of Environment and Development. Bellhaven Press, London. Archived from the original (PDF) on 2011-07-14.
- Balee WL (2000). "Antiquity of traditional ethnobiological knowledge in Amazonia: The Tupi-Guarani family and time". Ethnohistory. 47 (2): 399–422. doi:10.1215/00141801-47-2-399.
- Cesard N, Deturche J, Erikson P (2003). "Les Insectes dans les pratiques médicinales et rituelles d'Amazonie indigène". In Motte-Florac, E., J. M. C. Thomas (eds.). Les insectes dans la tradition orale (in French). Peeters-Selaf, Paris. pp. 395–406.
- Schmidt RJ (May 1985). "The super-nettles. A dermatologist's guide to ants in the plants". International Journal of Dermatology. 24 (4): 204–10. doi:10.1111/j.1365-4362.1985.tb05760.x. PMID 3891647.
- Twain M (1880). "22 The Black Forest and Its Treasures". A Tramp Abroad. New York: Oxford University Press. ISBN 978-0-19-510137-9. Retrieved 2015-12-13.
- Wilson, EO (25 January 2010). "Trailhead". The New Yorker. pp. 56–62.
- Parent A (2003). "Auguste Forel on Ants and Neurology" (PDF). The Canadian Journal of Neurological Sciences. 30 (3): 284–291. doi:10.1017/s0317167100002754. PMID 12945958.
- "1992 Excellence in Software Awards Winners". Software & Information Industry Association. Archived from the original on 2009-06-11. Retrieved 3 April 2008.
- Sharkey AJC (2006). "Robots, insects and swarm intelligence". Artificial Intelligence Review. 26 (4): 255–268. doi:10.1007/s10462-007-9057-y.
- Borror DJ, Triplehorn CA, Delong DM (1989). Introduction to the Study of Insects, 6th Edition. Saunders College Publishing. ISBN 978-0-03-025397-3.
- Hölldobler B, Wilson EO (1990). The Ants. Harvard University Press. ISBN 978-0-674-04075-5.
- Bolton, Barry (1995). A New General Catalogue of the Ants of the World. Harvard University Press. ISBN 978-0-674-61514-4.
- Hölldobler B, Wilson EO (1998). Journey to the Ants: A Story of Scientific Exploration. Belknap Press. ISBN 978-0-674-48526-6.
- Hölldobler B, Wilson EO (2009). The Superorganism: The Beauty, Elegance and Strangeness of Insect Societies. Norton & Co. ISBN 978-0-393-06704-0.
|Wikiquote has quotations related to: Ant|
|Wikimedia Commons has media related to Formicidae.|
|Wikispecies has information related to Formicidae|
- AntWeb from The California Academy of Sciences
- AntBase – a taxonomic database with literature sources
- AntWiki – Bringing Ants to the World
- Ant Species Fact Sheets from the National Pest Management Association on Argentine, Carpenter, Pharaoh, Odorous, and other ant species
- Ant Genera of the World – distribution maps
- The super-nettles. A dermatologist's guide to ants-in-the-plants