Solenopsis is a genus of ants commonly known as fire ants. They are small, reddish-brown insects that are known for their aggressive behavior and painful stings. Fire ants build large mounds in the ground and are often found in warm climates, particularly in the southern United States and parts of South America. These ants are social insects, living in colonies that can contain thousands of individuals. They play a role in the ecosystem by aerating the soil and controlling pest populations. However, their stings can cause allergic reactions in some people, making them a concern in areas where they are prevalent.