These Are the Biggest Ants in the World

Quick Take

• One giant ant colony has no queen, yet someone still rules it. Who, and how?
• Some ants don't build a home or raise their own young. They take someone else's.
• Spotting this ant indoors could signal a hidden problem in your walls.
• One ant is armed with a sting it rarely uses on its prey. Why hold back?

Almost wherever you go on Earth, you will find ants! The only places that do not have any are Antarctica, Greenland, Iceland, and some island nations. Not only are ants widespread, but there are also loads of them. Scientists have calculated that there are 20 quadrillion ants on the planet – and that is a conservative estimate. They play a crucial role in terrestrial ecosystems. There are 14,000 ant species that vary in color and size. Continue reading to learn about the biggest ants in the world.

Giant Amazonian Ant

As both its scientific name and common name indicate, the giant Amazonian ant (Dinoponera gigantea) is one of the largest ants in the world. Female giant Amazonian ants, which can be up to 1.5 inches long, are larger than males of the species, which are typically less than one inch long. Giant Amazonian ants are native to South America, where they live in a range of habitats from arid savannas to rainforests, where they nest on the ground. These nests consist of large chambers and tunnels and have up to eight entrances. A colony may occupy more than one nest (polydomy).

Giant Amazonian ants do not have a queen. Instead, they have specialized workers capable of mating called gamergates. There is a hierarchy and intense competition for dominance, with the alpha female gamergate having the highest ranking. She mates with males from other nests at night at the entrance to her nest. Colonies are also smaller than in many other species and only consist of between 30 and 96 workers, with an average of 41. Providing food for the colony is a team effort, with tasks designated depending on a worker’s position in the hierarchy. Lower-positioned workers scavenge for invertebrates, seeds, and fruits on the forest floor and bring them back to the nest. Workers can also use their venomous sting to subdue prey and for defense against vertebrate and invertebrate predators.

Bullet Ant

Bullet ants (Paraponera clavata) can reach 1.2 inches in length, with elongated bodies that make them look a bit like a reddish-black wasp, especially bullet ant queens, which have wings until after they mate. Their pincer-like mandibles look disproportionately large for their body. They live in tropical rainforests from Honduras and Nicaragua in Central America to countries like Brazil, Peru, and Venezuela in South America.

In this warmth and high humidity, mature colonies typically contain several hundred individuals. The nests are constructed at the base of trees, although arboreal nests have been rarely recorded. There are several entrances, and the nests are often covered in soil and vegetation.

Within the colony, there is a queen and many workers who perform different tasks according to their size and age, but this is flexible. Some workers complete tasks within the nest, while others forage in the trees for food. As omnivores, they feed on small invertebrates such as insects and spiders. They also consume nectar, honeydew, and plant sap, which they carry back to the nest in their mandibles.  

Panther Ant

Panther ants (Pachycondyla crassinoda) are some of the largest ants in the New World tropics, with an average worker body length of about 0.7 inches; queens are not significantly larger. They are most commonly found in the Amazon forest, but have been seen from French Guiana to Brazil. Panther ants live in rainforests where they nest in soil under rotten logs or damaged trees. The size of panther ant colonies is smaller than in some ant species and has been recorded at between 52 and 86 known workers, with a simple social structure.

A 2016 study of their foraging habits found that panther ants forage only at ground level and that the ants are more active when the weather is drier; they avoid wet ground. In terms of prey, they had a preference for live or freshly killed arthropods but would also forage on carrion and vegetation. The target prey were mostly a little smaller than they were, and they seldom used their sting on them. This is probably because it takes a lot of energy to produce the venom, and so they save it for defense. The foraging workers carry prey back to the nest in their mandibles.

Black Carpenter Ant

The black carpenter ant (Camponotus pennsylvanicus) is one of the largest carpenter ant species. The largest workers are around 0.6 inches long. They are native to the Nearctic region, and their range covers the eastern half of the U.S. Large colonies (up to 15,000 members) live in nests in deciduous trees and decaying logs, but they have also been found in wooden buildings. Within the colony, each individual has a defined role.

Black carpenter ants are an omnivorous species; they prey on insects, including aphids and their larvae. They also farm aphids in the nest, protecting them and then eating the honeydew that they produce. These ants manage to avoid their key predators, insectivorous birds, by foraging at night primarily. When black carpenter ants are attacked, they defend themselves by lunging forward with their mandibles open. Fights between different colonies can break out, with many workers being injured and killed. Finding black carpenter ants indoors is a sign of water damage or rotting wood. Even though these ants have no sting, they can inflict a painful bite and then inject formic acid into the wound!

Sugar Ant

The sugar ant (Camponotus consobrinus), also known as the banded sugar ant, is a common sight in woodlands, open forests, and backyards in Australia and Tasmania. They can reach 0.59 inches in length, but some workers are smaller, and the queen is slightly larger. Sugar ants’ heads are black, with an orange thorax and legs, and an orange band across their abdomen. Colonies are very large, nesting underground in open areas under stones or tufts of grass. They use their large mandibles for nest construction, collecting food, and defense.

Their name comes from their love of sweet substances. These ants are omnivores that feed on the honeydew, which they collect from farmed aphids. They also collect nectar from eucalyptus plants and other plant-eating invertebrates such as caterpillars. Foraging takes place in groups of 8-10 workers and at night. Sugar ants are not especially aggressive, but will defend themselves using their mandibles. Then they spray formic acid at the echidnas, birds, and other ants that prey on them.

Blood-red Ant

Blood-red ants (Formica sanguinea) are found in Europe, Russia. and Japan, China, and the Korean Peninsula. They are red/black in color, and the workers can reach 0.27 to 0.36 inches. Blood-red ants live alone and can be parasitic. A blood-red queen carrying fertilized eggs will enter the nest of another species, kill the queen, and get the workers to tend her offspring. They also raid the nests of other ants and steal the larvae, which will then grow up and become workers serving them.

Blood-red ants prefer to nest in sandy soils, usually under a stump, log, or stones. As well as eating the larvae of other ants, they also feed on honeydew. Foraging is usually carried out individually, but several workers may group together to deal with a large food source. They use formic acid as a chemical defense if they are attacked.

Southern Wood Ant

The Southern wood ant (Formica rufa) is found in Eurasia. Workers can grow up to 0.39 inches in length and are characterized by a red and brownish-black coloration, accompanied by large mandibles. They live in large colonies that can be made up of tens of thousands of workers in dome-shaped nests of grass, twigs, and conifer needles. These nests can be several feet in diameter and height and are found in forests.

Southern wood ants feed primarily on aphid honeydew (which they farm) but also prey on invertebrates, including insects and spiders. Foraging takes place hundreds of feet from the nest and can be in the trees or on the forest floor. They also raid other ant colonies. Birds and badgers prey on their eggs and larvae. These ants are highly territorial and use their huge mandibles and formic acid spray in defense.

Green-head Ant (Rhytidoponera metallica)

Green-head ants are a native species of Australia and are found in every state except Tasmania. They measure up to 0.28 inches with a metallic green coloration, sometimes showing a purplish sheen. Their colonies can be found in a range of habitats, including deserts, woodlands, forests, and even urban areas. Nesting takes place under logs and stones or even in termite mounds!

Foraging takes place during the day when the workers leave the nest to look for arthropods and small insects. Workers from larger colonies travel further to find food. They also feed on honeydew. Importantly, these ants can sting! They use their stingers to hunt beetles, moths, and termites, which they overcome by injecting them with venom. If you happen to get stung by one, it is likely to be painful but short-lived. An icepack or sting spray should soon relieve the pain.