The idea of the possibility of a new species came from an academic study I found in our local library a while ago. Wish I could remember it now. I am no expert on any of this, but it made a good argument for the idea. Kinda like the various turkeys around the country. For sure, these 'yotes are bigger and badder than the western desert varieties I've only seen in pictures and read about. But, deer size varies by region as well, could be for the same reasons, I guess.

Anyhow, any coyote that kills horses is bigger than I want running around my back yard! :)