Here in northern Alberta, West Nile hasn't been an issue. Nor have we seen any monopod crows.
The narrowing of gene pools might explain why some territory's crows seem much larger than others?? So large around here that I thought they were ravens.
Yes, for the most part. But the crows around here in the Alberta Boreal are large. I've been listening mornings to a young family of ravens (judging only by sound). The fledgelings sound like crow caws, but when the adult chimes in, it's more of a cronk. I wouldn't bet the farm on identifying by sound.