I believe Exaggeration and hoaxes do play a BIG part in these sightings too,but only a few years ago, a unknown animal now named the Okapi was discovered.
What about creatures we know of , but are thought to be extinct ? The coelacanth was thought to be extinct for 70 million years ,until they were discovered alive and well in 1938. So is it really that hard to believe that a hair covered, man-like creature could exist on the verge of discovery ?
Isn't it arrogant of us to assume we know of all the species on this huge planet ?
Some Bigfoot researchers cite American Indian traditions as the first recorded sightings of human-like hairy creatures. The first recorded sighting occurred in 1870 and was reported in the California newspaper - Antioch Ledger. The newspaper correspondent reported that he had witnessed a "gorilla, or wild man, or whatever you choose to call it in the bush. Its head appeared to be set on the creature’s shoulder without a neck".
So what ever these things are,they have been seeing them for a long time.
Indians suggested these things may live underground and thats why we can't find them. I believe there is a lot of mysteries in this world and things we just don't understand or know nothing about.
.