I have three sets of chicken: 3 older hens, 10 pullets that I got as chicks in midApril and 31 chicks than came at the end of May. The hens and pullets have been together for a few weeks and are getting along well. Yesterday I took the door off between the chicks and older birds so they could blend. This morning I went down to feed and water everyone and found the hens up on the high roost and the pullets cowered in the corner. The reason? One of the Black Star chicks was on their side of the coop and,apparently, this threatened them.