Fire ant

Fire ants are tiny bugs that live in big groups.

They build big mounds in the dirt. These mounds can be very tall.

These ants can sting. The sting feels hot like fire.

This is why they have their name.

Fire ants are very strong. They can live through big floods. They even make rafts to float on water.

They eat seeds and small bugs. They can even catch small lizards.

Some ants are very helpful. They help certain butterflies grow. Fire ants are amazing bugs to watch.

Fire ants belong to a group called Solenopsis. This group has over 200 species.

Most of these ants can sting. This sting feels hot like fire. That is how they got their name.

Fire ants have three body parts. These are the head, the thorax, and the abdomen. They have six legs and two antennae.

Many ants bite to hurt others. But fire ants are different. They bite to hold on tight. Then they sting with their abdomen. They use a venom called solenopsin. This venom can be very painful. It can even cause a bump that turns white.

These ants are very tough. They can live in many places. They do not sleep through the winter. They can even survive big floods. During a flood, they link bodies to make rafts. These rafts can hold 100,000 ants!

A queen can lay 1,600 eggs every day. This helps the colony grow very fast. Some colonies have many queens working together. They can grow to have 250,000 workers.

Fire ants are a group of stinging ants in the genus Solenopsis. This group includes more than 200 different species.

People often use names like "red ant" to describe them. However, many other ants are called red ants even if they are not in this group. Some weaver ants in Southeast Asia are also called fire ants because they bite painfully. The name "fire ant" comes from how their sting feels to humans. It creates a burning sensation like being touched by fire.

These ants have a very specific way of attacking. Most ants bite and then spray acid on a wound. Fire ants work differently. They use their mandibles to bite and get a firm grip on a target. Once they are holding on, they sting using their abdomen. They inject a toxic venom called solenopsin. This venom is made of oily alkaloids.

The sting can cause a bump that turns into a white pustule within a day or two. This process can be very painful for people.

Fire ant colonies are very organized and strong. A single queen can lay up to 1,600 eggs every single day. This allows a colony to grow to 250,000 workers very quickly.

The colony has different roles for different ants. Large major workers use strong jaws to crush and store food. Smaller workers clean the nest and care for the young larvae. There are also males that only exist to mate with queens. After mating, the males die outside of the nest.

These insects are incredibly resilient and can survive many hard jobs. They do not hibernate during the winter. In Tennessee, 80 to 90 percent of colonies died during very cold winters. They can also survive big floods by forming living rafts.

During Hurricane Harvey in 2017, ants in Texas clumped together on the water. These rafts could hold as many as 100,000 individual ants. They stay stable by sensing how the water moves. This helps the colony find a new home safely.

Some species, like the red imported fire ant, are invasive pests. This means they move into new lands and push native species away. They likely traveled to places like Australia and the United States in shipping crates.

In Australia, experts have spent hundreds of millions of dollars to stop them. In the United States, these ants cause huge amounts of damage to farms and crops. They even change how local animals live. For example, some lizards have developed longer legs to escape the ants.

Fire ants are a diverse group of stinging insects belonging to the genus Solenopsis. This genus contains over 200 different species found in various parts of the world.

While many people use common names like "red ant" to describe them, these terms can be misleading. Many other ants, such as Myrmica rubra, are called red ants but do not belong to the Solenopsis genus. Even weaver ants in Southeast Asia are sometimes called fire ants because of their painful bites. The name "fire ant" specifically describes the intense burning sensation their sting causes in humans.

The physical structure of a mature fire ant follows the typical insect body plan. Their bodies consist of three distinct sections: the head, the thorax, and the abdomen. They possess three pairs of legs and a pair of antennae. To identify a Solenopsis species, scientists look for three specific features. These include a pedicel with two nodes, an unarmed propodeum, and antennae with ten segments plus a two-segmented club. Invasive species in the United States often show a copper brown head and thorax with a darker abdomen.

Fire ants have a unique and highly effective method of attacking targets. Most formicine ants bite a target and then spray formic acid onto the wound. In contrast, myrmicine ants like fire ants use their mandibles to bite only to establish a firm grip. Once they are anchored, they use their abdomen to inject a toxic alkaloid venom called solenopsin. This venom is a compound from the piperidine class and is composed of over 95% oily alkaloids.

For humans, this injection causes a painful burning sensation and can lead to urticaria, or skin swelling. The sting site often develops into a white pustule within 24 to 36 hours.

Within a colony, ants are organized into specialized roles to ensure survival. The queens are the reproductive females and are generally the largest members of the group. A single queen can live for several years and may produce up to 1,600 eggs every day. This high reproductive rate allows a colony to grow to as many as 250,000 workers. Males, or drones, participate in nuptial flights to mate with queens. Once mating is complete, the males do not return to the nest and eventually die. The worker class is divided into different sizes, including minima, minor, media, and major workers. Major workers have powerful mandibles used for macerating and storing food, while smaller workers handle nest cleaning and larval care.

Fire ants are remarkably resilient and can survive extreme environmental shifts. They do not hibernate, which makes them vulnerable to extreme cold. For example, during several winters in Tennessee, 80 to 90% of colonies died due to consecutive days of very low temperatures. However, they are also famous for surviving floods through a behavior called raft formation. During Hurricane Harvey in 2017, clumps of ants formed living rafts on the water's surface. These rafts could contain as many as 100,000 individual ants. The ants can sense fluid flow conditions and adapt their behavior to keep the raft stable.

One specific species, Solenopsis invicta, is known as the red imported fire ant (RIFA). This species is an invasive pest in the United States, Australia, China, and Taiwan. It is believed that RIFA was accidentally moved between countries via shipping crates. In Australia, the invasion has been a massive economic challenge. Between 2001 and 2022, the government spent AU$644 million attempting to eradicate the ants. In the United States, the impact is also severe. The FDA estimates that over $5 billion is spent annually on medical treatment, control, and damage caused by RIFA. This includes roughly $750 million in annual damage to agricultural assets like crops and livestock.

The presence of fire ants can even force other species to change over time. Because fire ants are more aggressive than many native species, they often push others out of their habitats. A study from 2009 showed that lizards in parts of the United States adapted to fire ants in just seventy years. These lizards developed longer legs and new behaviors to help them escape the ants. Fire ants also interact with other species through complex relationships. They can be parasites, such as when they rob the cells of orchid bees. Conversely, they can be mutualistic, such as when they protect certain butterfly larvae in exchange for sugary fluids.