We got 4 chickens last week and 4 more on Sunday. I was told the first 4 were between 3-4 months old (she thought). And the second 4 were 3 1/2 months (he is positive on the age) old so I though similar ages great. What do I know about chicken ages. Well I think the first batch is much older they stand several inches higher. Here is my problem they will not stop pecking the smaller ones. I had to take the small ones out and put them in my daughters playhouse. We are still finishing the run so I plan to make a small removable fence for in there that can separate them until they grow a bit. Should I keep them separated? Are they just determining pecking order or will they continue to peck at them? Two of the birds are just relentless in their pecking. One will jump on top of the little ones and peck their heads. We only left them in there about 10 minutes cause I could not stand to hear their little cheeps of pain. If I should keep them separated at what age can I combine them safely? I have the coop blocked in two so that they all have a safe place to sleep for now.