I have 9 hens that are 1 1/2 yrs old and a 6 month old hen and rooster that I hatched. I have been noticing the rooster chasing one of the older hens the last few days. My chickens are free range, but due to the cold weather I have kept them in the run. Today when I went out to check on them I thought one of my hens was dead, the feathers on the back of her head were gone and her head was all bloody. The rooster was all bloody as well. I put him in the coop and went to pick up the 'dead' chicken. When I picked her up I realized she was still alive, she was just playing dead so the rooster would leave her alone. She ate and drank and I now have her in the house. I'm not sure if I can put her back with the flock. I have had ducks kill each other after one gets injured and I'm afraid this will happen with her. The rooster has always pen in the same pen with the hens.