Well, today was the first time I let the chickens out of their coop after being locked up for 7 full days. Earlier today I left the coop door open, and was gone for the day. I came home after dark, shone a light in the coop, and there they were: All four birds! However, they were all laying on the floor. Why would they choose that over their roost? I know they can reach the roost, as I've seen them sitting on it before... Perhaps they came inside when it was too dark and couldn't see it?