Blind mole rat
Blind mole rats are one of many types of rodents that are referred to as mole rats. Blind mole rats are truly blind. Their very small eyes are completely covered by a layer of skin. Unlike many other fossorial rodents, blind mole rats do not have enlarged front limbs and do not appear to use their forearms as a primary digging tool. Digging is almost exclusively conducted using their powerful front teeth. The teeth separated from the rest of the mouth by a flap of skin. When a blind mole rat closes its mouth. Its incisors are still on the outside. Because they are completely blind, blind mole rats have been important laboratory animals in tests on how eyes and eye proteins function.