When I was a kid I remember going into Dad's barn one morning. He had two old horse stalls on the far side that he had partitioned and wired off from the rest of the barn. Birds went out into a fenced run through a small opening maybe a foot square. Anyway on that particular morning I walk into the pen/stall and see a headless bird laying there and the rest were crowded off to one side. On the other side, up on the kick boards, sat a large great horned owl. It apparently after getting in could not find it's way back out.
I have been a firm believer in buttoning up all openings in all coops at dark since.
I have been a firm believer in buttoning up all openings in all coops at dark since.