‘Canadian superwolf’? Nope. So then why are Yellowstone wolves 50% heavier than Great Lakes wolves?

From WyoFile.com:

Wyoming wolves are stout compared to some other Lower 48 subpopulations, and the reason why they tend to run hefty is complicated.

In May, biologist Ken Mills published an annual report of Wyoming wolves that included an analysis of their weights in the southern Greater Yellowstone Ecosystem.