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It seems like something the size of a Bigfoot would need to eat like a Bear, therefor you'd see them eating from time to time, like bears and the occasional big cat. I don't see how a Bigfoot could chase down a deer and kill it and you never see then gathering fish, like bears. Good luck killing something by throwing rocks and sticks at it.
On the other hand the forests of North America, especially Canada are mind boggling huge. A lot of it hasn't been seen or stepped on by humans so anything could be out there really.
Some rich motherfucker should buy a fuckload of trail cams or GoPro's and start laying them out.