My coop is an 8x12 building with an 8x20 fully enclosed run arrached on the East end. I have a little pass through door that the birds go back and forth. It is never closed. I have human doors on the coop and the run. I built my coop so I could section off part of it and keep the feed and other supplies in it. In almost 3 years, I've never lost a bird to predators. They come and go as they please and I never have to put them up.