A week ago we rescued 3 pullets all a year old from a neighbor's 2 aggressive hens. Now our 2 older (8y/o) hens are chasing them away, dont allow them to eat together, dig around in compost or get onto the roost without being attacked. I have been trying to assist with their transition. How much should I intervene? Any ideas other than separating them? I've been raising chickens for 20+years and never seen such problems. The oldest hen is actually displaying "rooster type" behaviors! Even tries to crow which is actually funny.