My old roommate was convinced that Bigfoot was real. So, the white man eliminated buffalo, wolves and grizzly bears from Washington, Oregon and Cali. But somehow, a large ape species which must number at least several hundred to maintain a breeding population have left no dead bodies, hit by a car, shot by an elk hunter or died of natural causes has lived in the Western United States/Canada for a couple of hundred years. Most large apes are herbivores so what fruit or young stems does Bigfoot eat 24/7 in deep forests? Deer and elk thrive in burned over forest land as new growth appears and has unimpeded access to sunlight. Deer and elk get concentrated when the snow flies for months. Where does Bigfoot go? Herbivores need to eat pretty constantly as vegetation is a low calorie source for food. That's why humans as omnivores had time to invent sh*t because they could eat high calorie meat and cultured plants like wheat and rice instead of constantly eating.
No apes hibernate. That's how grizzly bears make it through winter.