I encourage the crows here to stick around. When they see a hawk they chase it off. Crows will take chicks and eggs but they can't get to mine. I have a heavy duty netting over all of my pens. I shut the chicks in at night but the older birds I don't. They all go into their coops at dusk. Eventually as they grow the chicks will too, especially when the weather gets cooler. I do have electric wire around my coops and pens to discourage predators and concrete under the gates to the pens. I don't let the chicks free range and occasionally I do the older birds when I'm working out around the coops. This time of year they would rather stay in their pens because there is more shade. I did have a sharp shinned hawk kill a bird once less than 10 feet from me and another time take a chick out of the chick pen right next to my husband. Now it's covered.