Here is another plausible theory on the subject of what people are seeing, when a bear happens to stumble into an area of people the first thing it does is stand up on it's hind legs
the reason it does this is to get a better grasp of what it is that it's looking at and also to make an announcement that it is there in case of a predator situation. Now randomly think if this
situation was to occur in a densely treed forest where it is naturally at times is dark and the sighting had occurred at dusk. All the viewer would see was a tall fury beast with dark eyes and
a face that is similar to a mans, fright occurs and the person quickly runs away only to tell his story to family and friends. This what I believe what started the Bigfoot legend and many
animal experts support that theory also.
Another thought I will throw in which comes to mind is why has there never been any tangible evidence of a dead carcass ever found outside of the already known species ?
Were the Bigfoot carefully burring their dead and then immediately saying the Lords Prayer afterwords.
The human imagination can play tricks into are own sub-conscientious can it not.