Tonight, when it's 20 Degrees out and the coop is like, 40, My 5 Hens wouldn't go inside the coop. Well, 1 did. So when I came home from my friends, my Brother told me they wouldn't go in. So I go next to the Coop where the stairs are and there are my 4 Hens, 1 Awake, the other 3 Asleep. So, I carry them into the coop and they roost and Whala! Any idea why 4 out of 5 didn't go in?