I read a book recently about the Momo and they provided a bunch of evidence for the link with bigfoot and aliens. It was interesting how many bigfoot sightings were associated with UFOs. Even in Indians legends for bigfoot, UFOs seem to have some connection. There is one tribe that suggests bigfoot came from a small moon that landed and others where they are associated with lights. I researched one myself once about Tahquitz which is said to be a giant hairy nocturnal cannibal that stinks and has fire balls (ball lightning?). Since Tahquitz lived on Mt. San Juacinto, I theorized the ball lightning might have been associated with the the nearby faults since quartz has a piezoelectric effect when squeezed but I digress. Anyway, I still think that if they exist, they are likely flesh and blood and a real creature, probably closely related to humans.
It is weird that if alien, they would manifest as a large smelly hairy hominoid that keeps to the forest at night and sometimes is seen eating berries, salmon and deer. In the book, the smelly part was explained away as something unpleasant implanted in the mind of humans. It seems too big of a stretch to me.
There may be more hairy Nebraskans wandering off season Paris than we know about.