The answer to 'what causes fire ant' is fire ants are a species of aggressive, stinging ants that build large, dome-shaped mounds in the soil. They are native to South America but have spread to many parts of the southern United States. Fire ants are attracted to warm, moist environments and often establish nests in lawns, gardens, and around homes.
The main reasons fire ants infest an area are the availability of food sources, such as pet food, garbage, and fallen fruit, as well as suitable nesting sites with loose, moist soil. Fire ants can also be inadvertently transported to new locations through potted plants, landscaping materials, or even in the soil of new construction sites.