I have been watching closely a flock made up of four hens, a rooster and a pullet chick by one of hens. The flock has a discrete home range territory that they exclude nonmembers from. Rooster is biggest but not only player. One of the feeding stations is on the border of the flocks territory. When this flock approaches, they drive off the flock of adolescent dominique crosses that are roughly same age as pullet. Immediately after, rooster will call pullet to feeder so she can eat while making certain the slightly larger dom crosses do not approach. Indicates he can tell young birds apart very well.