I have two BR hens now ~ a year and a half old and am trying to slowly intergrate my 3 month old Buff Rocks. It is not going well! They have been in the small run and coop seperated by mesh so have been very close and seen each other now for 7 weeks. When I try to put them in the big run with the two bigger hens they are really hard on them. They peck them pull feathers out and even try to sit on them. It was so bad that my one 3 month old appeared to have a brief injury to the head as she could not keep her balance for a while! My run is not huge, about 72 sq ft. which sounds big, but not really, so when they have no place to go without being cornered. I am really afraid they will hurt the younger ones or the pullets will end up hurting themselves trying to get away from them. I need to intergrate them soon as I will be leaving for two months. Please does anyone have advice on how to curb or at least lessen their aggression. I understand that this is normal but don't want my young ones hurt or killed!