Belonging to the Monomorium pharaonis family. Up to 300,000 workers with multiple queens will nest in wall and cabinet voids, behind baseboards, behind refrigerator insulation, inside hollow curtain rods, or in the folds of sheets, clothes, or paper. They follow plumbing and wiring and have been found in light switches and electrical outlets.
In colder climates they prefer to nest in heated buildings. Colonies are very mobile; workers, along with larvae, pupae, and even a few queens, may move to new locations if disturbed or if colony becomes too large. New nests can be formed by "budding" with as few as 5 workers, 10 preadults, and one queen migrating from the original colony. Development time (egg to adult) for workers is about 38 days at 80 degrees F. Workers live about 9-10 weeks, with only up to 10% out foraging at any given time. Queens live about 4-12 months, and males die about 3-5 weeks after mating.