I saw a flock of crows attacking some bird of prey in Idaho once and about 60 birds maybe but nothing of this nature...I wasn't in that area....here's what to do: likely cannot used shotguns(while I despise roost shooting anyways) just have sharp shooters with 1,000FPS pellet rifles say of .22 caliber and a good scope. If there are enough dead crows laying around they might just leave down town. But as western New York found out the huge roost in that vicinity just went to a neighboring town...how they got rid of them there is unknown to me. Fact is Idaho has a "small" problem compared to other areas across the country. But in Idaho is a huge problem...when it rains it pours!