I recently noticed a lot of feathers in my coop. It looked like an animal got in there with the amount of feather on the ground. When I was able to fully inspect my girls I have one with a lot of her feathers pecked out. I'm not sure if she's doing it to herself or the others doing it to her. The harder part of a feather is still attached to her. She's missing feathers on her wings, back and most of her tail feathers. I think it's due to the winter weather and being bored. Has anyone else had to deal with this issue? What can I do to stop them from continuing this? I live in NH(USA), will this cause issues with the cold weather with the chicken with less feathers?