We have crows here and I not only welcome them, I feed them to keep them around. I live in a very wooded area filled with hawks and the occasional eagle. The crows not only alert us but our flocks as well.
If we hear the crows, we know that there are hawks nearby. The chickens run for cover, even the ones in the covered runs, and the roosters look to the skies as do we. We usually see one or two hawks flying out of the woods with crows and/or ravens chasing after them.
We even had hawks trying to nest here last year but the crows wouldn't allow them to. They went somewhere else. I'm not a hawk hater. I actually look to the skies when I'm out to see them. I love them but I don't want them attacking my poultry.
Yesterday a crow landed in my goose pen and the ganders chased him right out of there. He was rooting around in the hay looking for something to eat because it was raining. He decided it was safer to be outside the pen rooting around for bugs then it was inside. LOL
Laurie