Naked mole-rats live in large subterannean colonies, often containing around one hundred individuals, which resemble those of some social insects. Colonies contain only a single breeding female and one to three breeding males, while the non-breeders of both sexes cooperate to maintain the burrow system and to forage for food. Amongst the labyrinth of tunnels which often exceed 3 km in total length, are communal nest and toilet chambers. These may act as "information centres" where social interactions occur on a regular basis. The high costs of dispersal and natal philopatry give a large window of opportunity for socially aquired information to be transmitted through overlapping generations. Social learning is implicated in recruiting animals to new food sources, role differentiation, and learning to discriminate individuals both within and outside the colony.