Wow I had a strangely interesting day... I have a wooded area on the far side of a 2 acre plot and there live 3 (I assume) crows.
I always have birds of prey, almost daily, hunting in the hay field around me. Mostly because it's overrun with voles, sigh. But today there was a persistant hawk, he hung around ALL day. And those crows gave him hell ALL day, lol!! I mean really harassed him. What a racket they made, crows cawing and hawk screeching. Wish I was able to video it, it was rather awesome. That hawk was eyeballing my chickens so I need to find a way to feed those crows so they stay close. Biggest crows I've ever seen.