I recently built a new coop, and got new hens and poulllets. I originally had one RIR hen, but got anouther RIR hen, BR hen, SLW poullet, GLW poullet, Black Comet poullet, and Black/Red sex-link poullet. They were put in my old coop before the new one, and no aggressive behavior was displayed, which i was thanful for. Suddenly, once they were moved into the new coop with my very young poullet Ashi and cockerel Cairo, the hens became very, very aggressive. Java, the original RIR, and Mocha, the other RIR, Are the two lead hens, and then there is the other hen, the BR (who STILL doesnt have a name ). At first, it was just Java. She would grab the back of Cairos head, and then repeatedly peck him. This only happened the first day, because i quickly put a stop to that by picking her up by her feet and hanging her upside down. She aslo done this to Ashi. After that, she has incited the other hens to be aggressive as well. Mocha, the tamest and calmest of the three, only charges the babies. Even more, she only does this when the other hens are around! The BR als charges and pecks the babies. We try our very best to stop them when they do this. Java and the BR are also very aggressive around the old poullets....the BR will actually grab the poullets tailfeathers, and pull them out! She also pecks and charges them. Java has charged and pecked them so much that they often make a wide swath around her now. Mocha still being the calmest, isnt aggressive at all towards the older poullets, unless she wants to share food. Is there anything i can do to stop this behavior? Is this natural? Whats causing this?