Hi, so I have 3 older hens and 3 younger hens of 2 different breeds. The older ones have recently been bullying the younger ones. The older girls have clipped wing while the younger fly. Untill recently the younger girls would just scoot out of the bigger girls way but now they are being attacked by the older ones and not fighting back. They are all completely free range and have separate nesting and sleeping areas. What am I to do?