For a couple of days this week, I have woken up to chicken noises in the dead of night. Thinking the chickens are being attacked, I have run outside to find them just fine, but with some of them walking around their run rather than inside their coop (I don't close the coop door at night). I have never seen a predator out there when I have gone out to look, and thinking it might be a rat or something, I have cleaned the coop thoroughly and found nothing. Any ideas on what would make them do this? Many thanks.