So I went to feed yesterday and there was blood all over in the coop. It was on the walls the nesting boxes and on the floor. While trying to sort out where it came from and thinking maybe someone had been bad one of the hens walked in with blood all over her head and comb. After bringing her in and cleaning her up I noticed that the back of her comb was torn from the base of her head in about a 1/4 of an inch gash. I brought her in cleaned her up and put some antibiotic on it to stop the bleeding and she was fine to go back out. As I continued my chores I noticed the water bucket had frozen over (it was 18 the night before) and there was a head shaped hole with blood on the ice just above it. I am thinking that she went to drink and got her comb stuck to the ice and pulled it to get it off. Has anyone else had this happen? These chickens have been living together since April with no problems and they are all really friendly and mellow. I do see the roosters breeding them, but I never see them being mean. They do their dance the the girls squat down. For the most part they don't even grab the girls feathers at all so I am not thinking it could be attack from another chicken. The only evidence other than the blood in the coop was the blood on the water bucket.