I have a small flock that contains 3 Rhode Island reds, 2 americaunas, and 4 australorps. The Rhode Island reds are the worst at going around and pulling the saddle feathers out of the others. They pull them out and eat them. The other chickens see it and eat them also. There are absolutely no feathers anywhere in the yard, run or house. I feed seed type feed and as much green as I can scrounge this time of year. I also bring them 10 gallons of sand and crushed oyster/clam shell a month. I did clip the beaks of the reds and one almost bled to death. Any other ideas?