Birds even learn to speak "crow." If the crows are just talking back and forth, my pigeons are visibly relaxed out in their aviaries and settling cages. Let a crow yell "hawk" and they all rush back into the loft. Since my resident pair and their 2 or 3 year old juveniles were wiped out by WestNile virus, the only crows that I have are visitors. I feed them, but they do not nest in the pines on the back of my property. I miss that original family.