Hello. So today I found in coop one of my 9 months old hen dead. Im curious about that, if it could probably be of my cockerels incorrect mating, + hen had virus in here, coughing, n heavy breathing. + in in the back off the comb bit biten off skin. I had seen my cockerels bite in hens comb and try to mate, hens head bending backwards, so. Anyone else had experience of this? P.S, search no predator signs. P.S.S, that hen had a rough life, when i bought it 2 months old, this one was the biten bird in the side, but we heal great and even was a heaviest hen of those sisters. P.S.S, after that one terrable night, they had coming those viruses on outside. She was only showing these signs, 'yesterday'.