Formica rufa

Red wood ants live in many lands.

They have red heads and black bodies. These ants build big nests. They use sticks and grass to make them.

Some nests are very large. They can be many metres wide.

These ants like to eat sweet food. They get it from tiny bugs. The ants also hunt other small bugs.

To stay safe, they spray a liquid. This helps them fight off enemies. They also use sticky tree sap. They put the sap in their nests. This keeps the nest strong. It also helps keep the ants healthy. These ants are very busy workers.

Red wood ants are busy insects found in many places. They live in parts of Europe and Asia.

These ants have red heads and bodies. Their back parts are dark brown or black.

These ants build very large nests. They use grass, twigs, and needles to make dome shapes.

Some nests are huge. They can be several metres wide. These nests often have many queens. This is called polygyny. Having many queens helps the colony grow and stay strong.

Red wood ants eat many things. They love to eat sweet honeydew from tiny bugs called aphids. They also hunt other small insects.

To stay safe, they use a special defense. They can spray formic acid from their bodies. They also collect resin from trees. Resin is a sticky substance. They mix resin with their acid to keep the nest healthy. This helps stop germs from growing. The resin also makes the nest strong and keeps it dry.

Workers also patrol the area to watch for danger.

The red wood ant is a fascinating insect found in many parts of the world. You might hear people call them southern wood ants or even horse ants.

These ants live in the boreal forests of Eurasia. Their home stretches from Great Britain to Lake Baikal. They can also be found from Scandinavia down to Anatolia.

Scientists study them because they are very important to their environments. They are a type of ant that helps manage pests in forests. This makes them very useful for people who work in forestry.

These ants have a very interesting way of building their homes. They make large, dome-shaped mounds using grass, twigs, and conifer needles.

These nests are often built against old, rotting tree stumps. They like to stay in forest clearings where the sun can reach them. Some of these colonies are truly huge. They can have 100,000 to 400,000 workers living together.

Some nests even have 100 queens to help the colony grow. These massive structures can be several metres wide and tall.

Learning about these ants has happened over a long time. A naturalist named John Ray first studied them in England. In 1671, he found a way to extract formic acid from them. He did this by distilling a large number of crushed ants.

Today, we know that formic acid is a special defense. The ants spray this acid from their abdomens to protect themselves. It is a clever way for a small insect to stay safe. This discovery helped us understand how they use chemistry to survive.

There are many specific facts about how they live and eat. Adult ants mostly eat a sweet liquid called honeydew. This liquid comes from tiny insects known as aphids.

They are also great scavengers and will eat other small insects. Workers can be between 4.5 and 9 millimetres long.

They also use sticky resin from trees to help their nests. This resin acts like a shield against germs and rain. It also makes the nest strong so it does not collapse.

Red wood ants work together in ways that might seem familiar. Just like a family, they take care of their young. Worker ants perform cocoon nursing to protect the babies.

They also use chemical signals to recognize their own nestmates. This is like using a special scent to find your friends. If an ant does not smell right, the others may attack. This helps the colony stay organized and keep its territory safe.

The red wood ant, scientifically known as *Formica rufa*, is a vital species within the boreal forests of Eurasia. This ant is the type species for the *Formica rufa* group, a classification established by the scientist Linnaeus.

Their natural range is quite vast. It extends from Great Britain and Scandinavia to Anatolia and Lake Baikal. While some reports suggest they exist in North America, these claims remain unconfirmed in specialized scientific literature. These ants play a massive role in their ecosystems by managing insect populations. Because of this, they are often introduced into forest areas to help with pest management.

Physically, these ants show interesting color patterns and sizes. The workers possess red heads and thoraces, while their abdomens are brownish-black. Some individuals may appear more uniformly red. Workers are polymorphic, meaning they come in different sizes, ranging from 4.5 to 9 mm in length. To tell them apart from similar species, scientists must use magnification to inspect their hairiness. For defense, they use a chemical weapon called formic acid. They can spray this acid from their abdomens to deter threats. In 1671, the English naturalist John Ray first extracted this acid. He did this by distilling a large number of crushed ants of this species.

Red wood ants build massive, dome-shaped nests. These mounds are constructed from grass, twigs, and conifer needles. They often build these structures against rotting tree stumps in sunny woodland clearings. The scale of these colonies can be enormous. A single colony may house between 100,000 and 400,000 workers. Some colonies even contain up to 100 queens.

Because of this, the nests can reach several meters in both height and diameter. These large structures are highly organized and serve as the center of the colony's life.

One of the most unique aspects of *Formica rufa* is its social structure, known as polygyny. In a monogynous colony, there is only one reproducing queen. However, *Formica rufa* is highly polygynous, meaning it has multiple queens. This structure allows the colony to expand through a process called budding. New nests can also form through temporary social parasitism. In this process, a new queen enters the nest of a different species, such as *Formica fusca*. She ousts the existing queen and lays her own eggs. The current workers then care for the new offspring until they take over.

Diet and foraging are central to the colony's survival. Their primary food source is honeydew, a sugary liquid produced by aphids.

They also act as voracious scavengers and predators. They hunt various invertebrates, including other insects and arachnids. Foraging trails can stretch as far as 100 meters from the nest. Larger workers are often seen traveling even further to find resources. When food is scarce, the ants must explore more trees, which makes their foraging less efficient. This constant search for food drives their territorial behavior.

To protect their large populations, these ants use a sophisticated chemical defense system. They collect resin from coniferous trees and mix it into their nests. This resin provides structural integrity, making the nest more resistant to collapse. It also acts as a waterproof barrier against the weather. Most importantly, the resin works with formic acid to provide antimicrobial and antifungal protection. The terpenes and phenolic acids in the resin inhibit the growth of pathogens. This management of the environment helps protect the vulnerable queens and developing brood from disease.

Social behavior in the colony is governed by chemical signals. Ants use these signals to recognize their nestmates. If an ant fails to recognize a fellow worker, it can lead to the decay of the colony's integrity. They are also known for organized raiding. Scouts investigate neighboring nests and mark targets using pheromones. These raids are used to expand territory or capture brood. By capturing the brood of other species, a colony can increase its workforce without the energy cost of raising new ants. This complex web of chemistry, social structure, and foraging makes *Formica rufa* a dominant force in the forest.