Their nest can be found under houses, under boards or stones, or in cracks in the concrete . Colonies frequently migrate from one site to another. The queen needs only a few workers to start a new colony. They can develop a new mound several hundred feed away from their previous location almost overnight. Flooding causes colonies to leave their mounds and float until they can reach land to establish a new mound.
Colonies also can migrate to indoor locations.
Mounds of loose soil, resembling gopher diggings, are found above ground. Mounds are generally numerous and easily sighted. Worker ants are dark, small, highly variable in size, aggressive, and sting relentlessly. Workers have the same body proportions from the tiniest to the largest. Head width never exceeds the abdomen width, even in the largest workers.