We just introduced 4 new hens to our small flock of a rooster and 3 hens. The dynamic between the older hens and the new hens has been normal - a bit of pecking to establish dominance, but nothing extreme. The odd thing is that our 2 new Americanas, sisters who were raised together and caged together, started seriously fighting once they were loosed into the group. Our chicken lady (a friend who helps us with our chickens, as I am fairly new) said to let them fight it out. One would win, and the other would slip into her place. We did this, but then the winner wouldn't allow the loser to go into the pen or henhouse (they are free-range). Poor little miss loser ended up huddled on a shelf in a cabinet on the porch of our shed. They fought until there was blood on their crests. I have the winner in a cage in the house, hoping that the loser will get used to the flock and not be so beaten down by her sister. Every time I allow them to be together, they fight to the blood. I am seriously considering clipping their beaks, (not debeaking). Any insight into what might be going on? I am assuming it might be about the rooster. He gets upset by the fighting and tries to stop them. He is very protective of his girlies, even intentionally giving them his treats instead of eating them himself. I am just wondering if I am missing something. Has anyone else experienced this, with siblings?