I have four levels of chickens right now. On my 3rd level (3-4 ) weeks, I lost a chick to a hawk today. I have them in an enclosed, in an open barn area and the hawk came down and tried to eat a chick in the pen. I'd been out there an hour before. Saw the hawk twice and didn't think it could get to the chicks... Now I know better. They are covered much better, with three layers of protection. Sad, but wiser.