I have 4 hens and they recently all started losing feathers around their tail feathers, some are worse than others and 2 are missing feathers on their underside by their butts. We have no roosters (100% positive), should be getting enough protein, and I haven't noticed them picking at each other. Each girl is laying everyday and aren't acting funny. I don't think its molting, not the season (I don't think). Maybe mites? we use a powder in their coop for mites and lice and clean it often. Any ideas or suggestions of what may be going on??? I'm worried. I apologize, the pictures aren't great but I couldn't get them to sit still for a good picture.