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Any of a genus (Solenopsis) of insects in the ant family, several species of which are common in southern North America. They are red or yellowish and can inflict a severe sting. The semipermanent nest consists of a loose mound with open craters for ventilation. The workers (seecaste) are notorious for damaging planted grain and attacking poultry.
This entry comes from Encyclopædia Britannica Concise. For the full entry on fire ant, visit Britannica.com.