Ant

Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. They evolved from vespoid wasp ancestors in the Cretaceous period. Ants are easily recognised 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 individuals living in small natural cavities to highly organised colonies that may occupy large territories with nests containing millions of individuals. These colonies usually consist of sterile, wingless female workers, soldiers, and other specialised groups, along with fertile males called "drones" and one or more fertile females called "queens" (gynes). The colonies work together as a unified entity to support the group.

Ants have colonised almost every landmass on Earth, except for Antarctica and a few remote islands. They thrive in moist tropical ecosystems. Their success comes from their social organisation, ability to modify habitats, and strong defence strategies. Ant societies show division of labour, communicate with each other, and can even solve complex problems. These traits have inspired scientists and humans for a long time. Some cultures use ants in food, medicine, and rituals. While ants can help control pests naturally as biological pest control agents, some species can become invasive species when they spread to new areas.

Etymology

The word ant comes from old languages like Middle English and Old English. Related words in German and other languages mean something like "the biter."

The scientific name for ants, Formicidae, comes from the Latin word formīca, meaning "ant." This Latin root also influenced words for ants in languages such as Portuguese, Italian, Spanish, Romanian, and French. The study of ants is called myrmecology, a term that comes from the Ancient Greek word for ant.

Taxonomy and evolution

The family Formicidae belongs to the order Hymenoptera, which also includes sawflies, bees, and wasps. Ants came from a group of stinging wasps. Scientists have found fossils of ants that lived millions of years ago. These ancient ants looked different from ants today, but they were the ancestors of all ants now.

Ants became very successful and spread around the world. They live in groups and work together, like some other insects. Termites are sometimes called "white ants," but they are not really ants and have different family trees.

Distribution and diversity

Ants live everywhere on Earth except Antarctica. You can find them on all continents and most islands, but not in places like Greenland, Iceland, parts of Polynesia, and the Hawaiian Islands. These small insects live in many different places and eat many kinds of food. Some ants eat plants, some hunt other insects, and some clean up dead animals.

Ants come in many sizes, from very tiny to quite big. Their colors can be yellow, red, brown, or black. Scientists have found more than 13,800 kinds of ants, and they think there may be up to 22,000 different types. The most kinds of ants live in warm, tropical areas.

Morphology

Ants have special body shapes that make them different from other insects. They have bent antennae and a narrow waist called a petiole. This connects their main body part (mesosoma) to their rear part (gaster). Their bodies have three main sections: the head, mesosoma, and metasoma.

Like all insects, ants have a hard outer shell that protects them and helps their muscles work. They breathe through tiny holes called spiracles. They move fluids around with a tube that works like a heart. Their heads have many sensors. They have compound eyes for seeing movement and simple eyes (ocelli) for sensing light. They also have antennae that pick up chemicals, air currents, and vibrations. They have strong jaws (mandibles) for carrying food and building nests.

Life cycle

The life of an ant starts from an egg. If the egg is fertilised, it will become a female; if not, it will become a male. Ants go through complete metamorphosis, which includes stages as a larva and a pupa, before becoming an adult. The larva is cared for by worker ants, who feed it and keep it safe.

After the larval stage, ants enter the pupal stage. Eventually, they emerge as adults. Ant colonies can live for many years, with queens living up to 30 years, while workers typically live from 1 to 3 years. In cooler regions, ants may go into hibernation during the winter to stay safe from the cold.

Behaviour and ecology

Ants talk to each other using smells, sounds, and touch. They leave smell trails on the ground to show where food is. If a trail gets blocked, ants look for new paths and mark the best one, helping the group stay safe.

Ants protect themselves by biting and, in many types, by stinging. Some ants, like bullet ants, have very painful stings. Others use special mouthparts that close quickly to catch anything that tries to get in. Ants also keep their homes clean to stay safe from bad things.

Relationship with humans

Ants help humans in many ways. They control pests and help make the soil healthier by moving dirt around.

Some ants have been used in traditional medicine. People have also eaten ants in many cultures. For example, in Mexico, ant eggs called escamoles are a special food, and in Thailand, people use red ant eggs in salads.

Scientists study ants to learn about nature and have used what they discover to create new technologies. Ants also appear in stories, movies, and games, often showing the value of hard work and teamwork.