I opened the door this morning to feed my 3 month chicks and a huge black snake was just starting to slide into the coop through the tiny ridge in the tin. I almost lost it! I am deathly afraid of snakes. We had even lined the top of our new coops with hardware cloth and he found a tiny hole and came right in. I know some people say not to kill a black snake, but to me a good snake is a dead snake. I had to get a friend and it took us 45 min. trying to get the thing out of there. My poor babies were so scared! It would have had breakfast if I had been 2 minutes later. I have a codo type new coop divided into three sections and different chicks in each one. I want everyone to be careful of the ridges in the metal roofs and make sure you fill them with something and put wire in the roof of your coops or you could face what we did. I am 5'6" and the snake was longer that I am. He was as round as a coke bottle. I don't know how he ever squeezed in there! Be Careful!