Even though I believe they are a flesh and blood biological creature I do not believe they are of a natural origin. Too many strange things associated with these creatures that goes beyond that which is normal and natural. For instance, when a bear, wolf, panther etc. goes sneaking thru the forest the rest of nature does not bow in silence to their appearing. There are many stories of how the woods go silent when these things appear; whether it’s small insects or larger animals and birds, they just all shut up. Perhaps not in every case but in many for sure. Also, many people feel an utter evilness when in their presence. I may feel scared or nervous around a bear, large cat etc. but I don’t think evil would be one of those emotions overwhelming me if these things were of natural origins. It certainly remains a mystery at this time!