In some Native American traditions (Navajo, Hopi, Mohawk...) the skin-walker or yeenaaldlooshii is a human who is able to shapeshift into various animal forms through witchcraft. Skin-walkers are generally considered frightening, evil, dangerous, and difficult to kill.

Yeenaeldooshi means literally "with it, he goes on all fours" in the Navajo language. The Mohawk Indian word "limikkin" is sometimes used to describe all skin-walkers.