Neither mole, nor rat, and with the social structure of an ant colony, the naked rat-moles (Heterocephalus glaber) cohabitate in large groups with a "Queen" female reproducing with a few select male minions and the rest of the colony digging tunnels with those big teeth, collecting food, and minding the young. Native to sub-saharan Africa, the naked mole-rats identify fellow colony members by smell, acquired by rolling around in the colony toilet. For more info, from The Smithsonian National Zoo