The answer to 'what causes fire ant' is that fire ants are an invasive species of ant that are native to South America but have spread to many parts of the United States, including the Southern and Southeastern states. Fire ants build mound-shaped nests in the soil, often in open, disturbed areas like lawns, gardens, and fields. They get their name from their aggressive behavior and the painful sting they deliver when their nest is disturbed.
Fire ants are attracted to areas with ample food sources, such as pet food, fallen fruit, and crumbs. They can also be drawn to areas with high moisture content, like leaky pipes or overwatered landscapes. Improper disposal of trash and yard waste can also contribute to fire ant infestations, as these provide food and nesting resources for the ants.