Hello, i got thee more chickens on saturday to add to my current three. They are the same breed and not much difference in age. Ever since i have had them, my three older hens keep attacking my three new hens! It is very aggressive, clinging on and pull big clumps of feathers out. My new hens just will not go any where near them, they will just perch and seem as my older hens never perch they do get some peace for a while. I was thinking maybe they are being territorial, and would stop after they get use to them but it has been 5 days, and i am fed of them having a go constantly. Any suggestions??