The bigheaded ant is a common name for a variety of species belonging to the genus Pheidole that live throughout the United States. The species Pheidole megacephala is invasive and considered dangerous to indigenous ant populations, as it displaces them. It is notable for its presence in South Florida.
The bigheaded ant's name is derived from the enlarged head of its soldier caste. While the bigheaded ant is a major pest in certain parts of the United States, it is not considered harmful to structures or humans and does not bite unless its nest is disturbed. Bigheaded ants live in the soil and are omnivorous, subsisting on a diet of other invertebrates and honeydew.