This is something that people have been undecided about for many years now, with some reports that look like they could be true and more that look totally fabricated. No one even believed that the Panda bear was real until sometimes in the 1800’s, and even that was considered just a legend.
After someone killed one and brought the pelt, then other people started hunting high in the mountains where the Panda bear lives, and eventually, they trapped one.
The Panda bear is black and white and doesn’t even try to hide from anyone, it just lives in such a remote area that people were not around to see it for all of those years, so it remained a legend.
There is a large percentage of this earth where humans have never been, and we discover things that no one knew existed all of the time, especially we have found ocean creatures that were considered to not exist.
I think that it is quite possible that there are also more creatures that exist and we just have not seen them because we do not go where they are at.
The legends about the creature we call Bigfoot are actually worldwide, different sizes and different names; but a very similar description. The legends have been there for centuries, and it just seems to me like if the stories are all over the world, from people who had no contact with the other countries, and they all reported the same kind of creature, then there could be truth in the legends.
There is a story from Russia about one that was captured and lived in a Russian village, and had half-human offspring, which are buried in the local cemetery .
No idea if it is true or not, but it is an interesting story.