My americauna is getting ready to lay an egg so I thought I would sit in and watch. She was sitting in her nest and grabbing shavings and pieces of hay from around her and putting them on her back. Other stuff she would nuzzle up next to her. She looked pretty comfortable and like this was routine for her. Any ideas? I have never seen her do this before. I can understand pulling stuff around her for a nest, but on her back?