Oh Big foot, I strongly suggest you stop harping on that one. Not because I have a fetish for tall hairy beast men, but because they will most likely get solid evidence for a 'hidden species'.
Yeah I know, so many humans with guns, the whole world colonized by the cancer I humorously call humanity. But if you sit down and look at the maps and see how much vast territory still wholly unexplored by foot in the Pacific North West alone (forget the large swatches of land in the Himalayas, The Middle of South America, the middle of Africa) this is one you have to say 'possible' to 'probable' to especially when new species keep on being 'discovered' in places like South America where they are hard at work leveling those tropical jungles and building parking lots and highways - you know, useful things.
Further reading and I discovered that there is a real science behind gathering data from foot prints - they can tell a lot of things, how fast the creatures was going, how heavy it was, even the very mechanics of how it foot works to distribute the load while walking. BTW humans do it all wrong, we 'roll' side to side with the weight growing from heal to out-step to ball to big toe. Every foot print of a big-foot that has not been deemed a hoax demonstrates that they don't roll from side to side, heel to ball to all toes.
That walking motion is impossible to mimic with stamps, and such heel to ball without going to outer foot is how Neanderthal walked (we have the footprints, which no science denies is neanderthal). Further more, its not a person strapped on foot extenders and took a walk, a human being cannot walk that way. We are not designed to do so.
Great Gorillas would have been on this list of 'impossibles' not too long ago, they were a source of myth only and poo-poo'ed until 1902 when someone was finally able to capture one alive - oh wait no, it was murdered for the sake of pleasure and then was made into a discovery note. Humanity... riiiight.
Olinguito From the Americas.
Caqueta
titi monkey, an adorable, tiny primate notable
for being one of the few monogamous monkeys and for purring like a cat.
The sneezing monkey of Burma
Durrell's vontsira
(Salanoia durrelli) in honour of conservationist Gerald Durrell. (2010 discovery).
They are still STILL finding new waterfalls in Yosemite Park. If we are missing whole waterfalls, then a few ape creatures hidden in the vast treacherous forested mountains of the Pacific North West is not inconceivable.
As an aside, few back packers go beyond the trails, those who do set up expeditions, with teams and break new ground all the time discovering stuff that is just not seen from space or airplanes. The Geological Survey of North America was done via plane and satellite, not by men out there measuring with chains and taking sightings.