Shinwalker

In some Native American legends, a skin-walker is a person with the supernatural ability to turn into any animal he or she desires, though they first must be wearing a pelt of the animal, to be able to transform. Similar lore can be found in cultures throughout the world and is often referred to as shapeshifting by anthropologists. A skinwalker is usually described as naked, except for an animal skin. Some Navajos describe them as a mutated version of the animal in question. The skin may just be a mask, like those which are the only garment worn in the witches' song. Because animal skins are used primarily by skinwalkers, the pelt of animals such as bears, coyotes, wolves, and cougars are strictly tabooed. Sheepskin and buckskin are probably two of the few hides used by Navajos; the latter is used only for ceremonial purposes.
Often, Navajos will tell of their encounter with a skinwalker, though there is a lot of hesitancy to reveal the story to non-Navajos, or (understandably) to talk of such frightening things at night. Sometimes the skinwalker will try to break into the house and attack the people inside, and will often bang on the walls of the house, knock on the windows, and climb onto the roofs. Sometimes, a strange, animal-like figure is seen standing outside the window, peering in. Other times, a skinwalker may attack a vehicle and cause a car accident. The skinwalkers are described as being fast, agile, and impossible to catch. Though some attempts have been made to shoot or kill one, they are not usually successful.