My juvenile chickens have been outdoors for 2 to 3 months and HAD quickly caught-on to the practice of them returning INTO the coop every evening at dusk and roosting there. I go lock them in around dusk. However, For about a week now, instead of going IN the coop at dusk, they go ON the coop and roost there. They give me a hard time when I try to catch them and put them inside where it's safe. Does anyone know why they would suddenly, and without any good reason that I'm aware of, change and want to stay on the roof at night?? I can't let them stay there b/c we've raccoons, owls, etc I've checked the coop interior too and there's no danger or anything different about it than there had been. Any ideas?