Today I found 2 of my hens with their combs pulled practically completely off. Both are quite bloody and appear in pain. One is worse than the other. My Plymouth Rock rooster is about 6 to 7 months old. I suspect him. They are enclosed in a very secure coop at night, and during the day they freely roam in a secure half acre meadow. We have hawks and eagles around. I suspect the roo, as he likes to pull on the back of their heads when he mounts.