Yeti mythos

- Yetis are the same species as Sasquatches; besides fur color, they differ by where they live and social habits

- Yetis are carnivorous but do not eat humans

- Yetis and humans have a long history of contesting the same environments and resources. That is the basis of the longstanding hatred yetis have for humanity 

- Yetis live in those high bowl shaped valleys to stay out of the way from an ever-encroaching human presence

- Yetis are incredibly strong and can throw boulders many times their own size. In fact, this is their primary form of attack: to gain high ground on their enemy (typically humans) and hurl down boulders, which destroy everything in their path, humans, trees, or whatever. Many rockslides are actually yeti attacks

- Yetis were betrayed at the Meeting at the Birches, where humans surrounded them under the pretense of a peace negotiation and burned hundreds of yetis:

This solidified their hatred of humans

- Yetis eliminated the last of the North American Neanderthals on this glacier, forcing them over the edge:

This destruction was so final that you've not heard of the North American Neanderthal.