1. The Crows I've seen around my property seem healthy, although I haven't seen them for awhile. 2. There were three Crows that used to come around. There was never any that I noticed, seemed like they were friends just hangin' out. We did have a Raven stop by last summer. That was a treat since it was the first one I had seen here in Connecticut.
One of the things I really enjoy is photographing the birds that come to my backyard. Sometimes they get close enough for a nice portrait without worrying about the "rules". But they are just guidelines.