I have 3 hens, and only one is laying. BO, EE, Australorp. The BO is my star egg layer, so far has laid 16 eggs in 19 days. I just noticed today that she deliberately yanked a chunk of feathers out of the Australorp's behind, and then proceeded to EAT THEM!! She did it again an hour later to the same bird, and even took a tiny chunk of down out of the EE's behind and ate those too. What gives?? She's got all the oyster shells she wants at her disposal, and I give them grit, and all kinds of treats, from worms to cheese to all manner of produce. Anyone have any ideas?