Highly social, prairie dogs live in large colonies – collections of prairie dog families that can span hundreds of acres. Families usually are made up of one male and two to four females living in a strict social hierarchy. Prairie dog pups reach sexual maturity at about 3 years of age, and after their third winter the dominant male in a given family will drive them away, forcing them to establish their own families on the edges of the colony. The dominant male will defend the family's borders against rival prairie dogs, and disputes are resolved by fighting. Prairie dogs are also aggressive against predators such as badgers and snakes. 