I have 4 hens that were in a fairly roomy pen all last year. This year we got an electric chicken fence so they'd have more room. The hens have figured out how to fly over the fence and free range and then return in the evening. That's fine. Except one of the hens has decided that she prefers to sleep in a tree on a branch about 20 ft up. She's been doing that for about a week now. So I'm wondering what will happen when the weather gets cold and it snows...