According to Native American traditions the Skin-walker sometimes known as Yeenaaldlooshii is a human capable of shape shifting into various animal forms by the use of witchcraft. Skin-walkers are generally considered very dangerous, evil, and extremely difficult to kill.
The native word Yeenaeldooshi literally means "with it, he goes on all fours" in the Navajo language. A more generic word “Limikin” is used by the Mohawk Indians to describe all skin-walkers.
In some versions of the native stories, men or women who have attained the highest level of priesthood then break a cultural taboo by the act of killing an immediate member of their own family, and then have thus gained the evil powers that are associated with Skinwalkers.
Most frequently seen as a coyote, wolf, owl, fox, or crow, the Yeenaaldooshii is said to have the power to assume the form of any animal they choose, including birds, depending on what kind of abilities are required. Like the Werewolf of European legend the Skinwalker will normally change of a night, however unlike the Werewolf it does not need there to be a full moon to do so. When a Skinwalker has changed into its animal form it becomes lightning fast and almost impossible to shoot or kill. Due to their association with Skinwalkers even animal pelts are taboo to own in Navajo culture
Skinwalkers can go to great lengths to lure their prey, they can imitate an infant or close family in peril to lure an unfortunate victim. If a Skinwalker is injured in its animal form, legend states that the injury will show when the Skinwalker returns to human form, even the most effective Skinwalker is unable to imitate the walk or gait of its intended animal perfectly, thus it does have a couple of weaknesses. Legends of Skinwalkers are very similar to legends of other creatures from around the world, Lycanthropes or Werewolves in Europe, Wereleopards in Africa for example. Is it possible that we as humans cannot believe the wickedness of the atrocities that some men are capable of and choose to blame an animal instinct we have no control over for evil that's too hard comprehend?