Structures found in Russia
If there are unidentified giant primates (called sasquatch, yeti, or countless other names in different regions), where do they sleep? One idea is that they build nests by twisting branches and small trees together as nests (some of which might be called crude mattresses) in gorilla fashion, and even shelters, which known nonhuman primates don't make. An expedition in search of Russian "Yeti" evidence led, as Ben Radford of the Skeptical Inquirer reports here, to a split between the two most prominent North American scientific investigators, with Drs. Jeff Meldrum and John Bindernagel divided on whether structures found in Russia added to the evidence in favor of such creatures.
COMMENT: Such structures have been reported in North America. In areas where humans are at least occasional visitors, I thought they were likely made by kids making wigwams, forts, camp beds, etc. I did the same thing myself growing up in Florida. That's not the explanation for all such sites, but maybe it applies more often than is usually realized. Kids can push pretty deep into the woods seeking their own worlds.