Solenopsis geminata, commonly known as the tropical fire ant, is a species of aggressive and highly invasive insect. It is native to South America but has spread to many parts of the world, including the southern United States. These ants are known for their painful stings and large colonies, which can cause significant damage to crops and ecosystems. They are reddish-brown in color and have a distinct two-segmented waist, making them easily identifiable.