Supposedly, corvids are highly susceptible to west nile, and the population of crows, ravens, whiskeyjacks, and jays showed not the least bit of decline in the areas I hunt. The DNR in MN warned us, a few seasons past, that a pile of dead corvids that was discovered was not something to take lightly. I've never seen that, however.
Best,
Ted
I cannot imagine how West Nile Virus can kill Corvids and they end up in a pile, unless somebody piled them, but this is what a pile of dead Corvids looks like, in case you ever do run across one. Courtesy of L C Smith.

postscript: They don't always die from "West Nile" ............... but the end result, as far as the crow is concerned, is the same.
Regards, SRH