I came home today and checked on my chickens and 4/6 of them are bleeding from their comb area. They were locked up in their coop and I noticed that some had blood around their combs and head feathers. There isnt any evidence of any predator attack where they could have gotten in. It was cold last night but not much below freezing. Most of their water froze and they were somewhat thirsty now (Dont know if they could be pecking each other because of that?). The only blood in the coop/run is where they would hit their heads around the water nipples or water can but otherwise I dont see where this could have happened. I didnt see any blood around their beaks though so Im not sure if they attacked each other or not. I know I should probably separate them but I am not sure how. I have 6 chickens in one coop now. They seem to be acting pretty normal right now and are around each other like normal walking around now that I let them out to free range a bit. All six of them layed eggs today. If it is below freezing tonight, could the ones that are/were bleeding be in any extra danger? If there is something I could do now to help them or to protect them form this happening again I would appreciate it.