Native-invader
Guides
Tapinoma sessile
odorous house ant, sugar ant, stink ant, coconut ant
Tapinoma sessile is a small, highly adaptable ant native to North America that has become one of the most common household pests in the United States. The species exhibits remarkable plasticity in social structure: forest colonies are small, monogynous, and inhabit single nests, while urban colonies achieve massive supercolony status through extreme polygyny (multiple queens) and polydomy (multiple interconnected nests). Workers produce a distinctive odor when crushed, historically described as coconut-like but chemically confirmed to match blue cheese due to shared methyl ketones. The species spreads primarily through budding rather than independent colony founding, and shows high tolerance to many common insecticides, contributing to its persistence as a pest.