Supernatural by this account from the link Jurgen provided. Nasty creatures by the sound of it, I wouldn't want to meet one, reminds me of the current zombie craze in horror movies.
The Wendigo is part of the traditional belief systems of various Algonquian
-speaking tribes in the northern United States
, most notably the Ojibwe
, the Cree
, the Naskapi
and the Innu people
Though descriptions varied somewhat, common to all these cultures was the conception of Wendigos as malevolent, cannibalistic, supernatural
) of great spiritual power.
They were strongly associated with the Winter, the North, and coldness, as well as with famine
and starvation. Basil Johnston
, an Ojibwe teacher and scholar from Ontario
, gives one description of how Wendigos were viewed:
“The Weendigo was gaunt to the point of emaciation, its desiccated skin pulled tautly over its bones. With its bones pushing out against its skin, its complexion the ash gray of death, and its eyes pushed back deep into their sockets, the Weendigo looked like a gaunt skeleton recently disinterred from the grave. What lips it had were tattered and bloody [....] Unclean and suffering from suppurations of the flesh, the Weendigo gave off a strange and eerie odor of decay and decomposition, of death and corruption.
At the same time, Wendigos were embodiments of gluttony, greed, and excess: never satisfied after killing and consuming one person, they were constantly searching for new victims. In some traditions, humans who became overpowered by greed could turn into Wendigos; the Wendigo myth thus served as a method of encouraging cooperation and moderation.
Among the Ojibwe, Eastern Cree, Westmain Swampy Cree, Naskapi, and Innu, Wendigos were said to be giants, many times larger than human beings (a characteristic absent from the Wendigo myth in the other Algonquian cultures).
Whenever a Wendigo ate another person, it would grow in proportion to the meal it had just eaten, so that it could never be full.
Wendigos were therefore simultaneously constantly gorging themselves and emaciated from starvation.
 Human Wendigos
All cultures in which the Wendigo myth appeared shared the belief that human beings could turn into Wendigos if they ever resorted to cannibalism
or, alternatively, become possessed by the demonic spirit of a Wendigo, often in a dream. Once transformed, a person would become violent and obsessed with eating human flesh. The most frequent cause of transformation into a Wendigo was if a person had resorted to cannibalism, consuming the body of another human in order to keep from starving to death during a time of extreme hardship or famine.
Among northern Algonquian cultures, cannibalism, even to save one's own life, was viewed as a serious taboo
; the proper response to famine was suicide
or resignation to death.
On one level, the Wendigo myth thus worked as a deterrent and a warning against resorting to cannibalism; those who did would become Wendigo monsters themselves.