I want to first say that I'm so sorry if this is a dumb question! I am new to chicken keeping, my babies are less than a year old, so I'm seeing everything for the first time! When I first started noticing that my girls' feathers were getting thin in places, I assumed they were molting. Some of them have regrown feathers in the places that were looking thin, but just now I noticed that one of them has a fairly large, completely bald spot on her back! I was shocked and I would love any feedback I can get. Thanks!