I was really into reading about bigfoot when I was kid, enough that it would freak me out when I was out squirrel hunting alone with .22.
Bigfoot, Yeti, Sasquatch, MoMo, swamp ape, etc, etc, etc, have been reported worldwide. Native Americans and other early civilizations have stories dating back centuries of them. UFOs have been reported worldwide dating back centuries. We don't have proof of alien spacecraft, but I think it borders on insanity to think we are the only intelligent life in the universe. So why have we not found a bigfoot corpse? Because if they croak on earth they get beamed up to the mother ship so they can have a proper burial on planet Sasquation. Seriously though, what if bigfoot sightings are the pilots of UFOs? If they were smart enough to design space travel, they would likely be pretty sly when on the ground too.