*Sigh* Feather pecking. This is all new to me. My beautiful rooster is being picked on by the hens. I mean, his neck is bare! I wanted to see who was doing it, so I sat and waited. After a short while, sure enough, one of the Rhode Island Red hens started pulling out neck feathers, then moved to his body. He walked away and she went after him. She's not being aggressive, mind you. There's no blood or wounds. But there might be soon if I don't do something about it. Feather pecking is just redirected ground pecking and is normally not done in aggression. I've been told she may be lacking in protein. I've read that RIR's may need more protein than other breeds. It was suggested to feed them cat food, or chick starter. I'll experiment a bit and see what happens.
Update: turns out my rooster was sick. He has since passed on, and the hen doesn't do it to anyone else! Maybe she knew.