I put my young chickens in my coop with my other chickens and one mean rooster. I left the young one in their cages till they got use to each other. The little onesmust have poked its head out of the cage and I think it was that rooster literally sliced it from its sholderblade area to the tip top of its head. You could see the muscles and tendons in its neck that was 2 days ago and the little thing is doing fine. That rooster has attacked my and sliced my leg in 2 placed and attacked my sister and cut her as well. When do you say enough is enough and ring the dinner bell on him.