We have (had) 7 young chickens (about 18 weeks): two roos and 5 hens. The roos seemed to be getting along fine, although one was definitely more dominant than the other, and we were hoping to keep them both. Two days ago we got our first egg. Yesterday morning we went out to let them out (they free-range during the day) and the more submissive roo had been attacked and mutilated. Needless to say, we were devastated and assumed that the dominant roo killed him. This morning when we went out, one of the hens had been attacked as well. She was still barely alive, but we put her out of her misery. Is this the rooster and/or other members of the flock killing each other? Our coop has been very secure up to this point, and I don't think predators can get in (but I'm a newbie, so what do I know?). Any advice would be greatly appreciated, as I want to take steps to make sure we don't lose any more!