We seem to have a cooper's hawk in the neighborhood. It swooped down over the backyard (right over our 2 RIR's), then flew up over the fence and into the yard behind us. I've read that's how they hunt - flying low then swooping up over something to catch their prey by surprise. I'm not sure if the hawk was after my girls and changed it's mind because hubby and I were in the yard, or if it was after something in the yard behind us. Do I need to be concerned? Will a cooper's hawk go after a grown chicken? Do hawks hunt any particular time of day - or is it an all day kinda thing. I don't want to have to coop the girls up in their run, but will do what's necessary to keep them safe (protests and all).