I have two Red Star chickens (a layer breed). One of my chickens is bigger, tougher, and a better layer than the other, in case this means anything. Today I was washing her feet when I noticed that she had a bare belly with a strip of feathers right down the center. The chickens eat plenty of their food (layena) and snack on bugs, grass, etc. We checked the smaller one but her belly was covered in feathers. This chickens are a little over 1 year old. Is this normal or should I do something, and if so, what? Thank you all so much!