Both sexes are sturdy, large-bodied rodents, with blunt snouts, cylindrical torsos and short limbs. The forefeet are heavily adapted for digging, with powerful curved claws. To enable to move more quickly through tight tunnels, the body has few visible external features; for example, there are no pinnae or scrotum, and the penis retracts into a concealed sheath. Lip-like flaps of skin are able to close behind the incisors, preventing soil from falling into the mouth. The eyes are small, but not permanently closed.