I personally think that Bigfoot is very big highly intelligent apes. They are capable of a type of speech for their species. That is the monkey, chatter that people no doubt have reported hearing. But, it is a much more advanced form. Are the human? No, they are very advanced and intelligent apes as I said before. They seem to be capable of even using some human words. They seem to be capable also of mimicking sounds that other animals make to some extent. But, that should not be so surprising as there many birds who we know have the gift of mimicking other animals and human sounds. Bigfoot is no Neanderthal, as they didn't know to be very tall. Bigfoot, may well be a descendant of Gigantopithecus, who like man and other animal species also have produced certain variety within it 's species. That is why some can look a little different but yet they are still the same species. Still as intelligent as Bigfoot is, it is still an animal. With some more peaceful towards humans then others.