Fire ants are an aggressive ant species who sting their prey with a generous dose of venom, leaving behind painful, itchy, burning welts. Some fire ants can build massive colonies as large as 500,000 worker ants per colony. Luckily, when you have fire ants invading your property, you can turn to TERRO® fire ant solutions! Treat fire ant mounds directly to eliminate the colony before they further invade your property.