Like the werewolf, the skin-walker is a shape-shifter, human at times, and at other times taking on the aspect of an animal, usually at night. In its animal form, a skin-walker may be virtually anything, including a wolf, coyote, fox, bear, owl, or crow. Although skin-walkers may have a favorite form that they customarily use, they have the power to become anything they wish. In animal form, a skin-walker is very fast and impossible to catch.