Usually my pullets come flying out of their coop each morning when I open the door. But one morning last week, they would not come out, even when I fed them. They cowered in the corner and eventually, when they did come out, spent most of the day hiding under the coop. This morning, they did the same thing, cowering in the corner of the coop. They act the way they acted when they were attacked on that Friday 13th. Do you think something is trying to get to them during the night and is scaring them or is this normal for 12 week old pullets getting used to the world?