The clan of crows hanging around my place have been around for years.I consider them good allies as well as blue jays..My hens pay attention the the cries of crows and blue jays, and no when danger is around..
I've been feeding crows scraps way before i even got chickens.I've never had any issues with crows stealing eggs through the pop up door.They never harass my hens. I would never let baby chicks out in the open, so they have never had that chance here.
They are around here often, and hawks don't stay around long.I know some folks here have had bad experiences with crows.I like them and thier welcome here. Bluejays signal when cats are around and the hens listen to the advice, and keep a watchful eye....