The answer to 'what causes fire ant' is fire ants are a type of aggressive, stinging ant that build large, mound-like nests in the ground. Fire ants are native to South America and were accidentally introduced to the United States in the 1930s. They thrive in warm, moist climates and can quickly establish large colonies that can be difficult to control.
Fire ants are attracted to areas with abundant food sources, such as pet food, fallen fruit, and crumbs. They also build their nests in places with plenty of moisture, like under logs, rocks, or around the foundation of homes. Their nests can grow quite large, sometimes reaching up to 2 feet in height and several feet across.