Yesterday, we saw a red tailed hawk fly over my chicken coop. I have 4 hens. They have a secure coop at night, and in the day, they have a run they hangout in. Yesterday, when the hawk flew above, all the chickens ran under the bush. My coop is set up in such a way, that there is no easy way for a hawk to swoop down real quick, grab it, and come back up. There's also a tree that covers a fourth of the run. Are they safe, or not?