I have a two year old Australorp who began sitting on the nest box yesterday and stayed on for several hours. I wondered if she was egg bound although she really didn't show any other symptoms and gave her a warm bath. She ate heartily after this and produced a large poop but immediately after being put out in the coop with the others, she climbed back in the nest box even though it was after dark. This morning she was still in the nest box so I took her out and gave her another, longer warm bath. She seemed content to go back outside and pecked and scratched for a while in the yard before preening for about half an hour. Tonight she is back in the nest box and I'm wondering what is going on. I have fake eggs in there and they are all tucked underneath her but I don't think she has laid for a day or two. Her tail is up, she is eating and seems alert, not listless so I am at a loss to figure out what is going on. Anyone have any ideas?