I could use some advice, I'm not sure why this is happening or what to do. I have two hens; one is a Red Sex-link, the other is a barred Plymouth rock (both 6 months old). As of recently, my Red one has been attacking and injuring the black one. They are in a nice coop that is large enough for more, they have plenty of food and water. She is tearing her comb off and taking chunks out of her leg. I have had to bring the black one in the house so that she can heal up because the red one will not stop. I'm not sure what is causing this (other than I have not been able to let them out as much as I normally do) or how to stop it. Could someone please help me with this.