So these are my first chickens... I've had these barred rocks since chicks, and they are now almost 5 months old. 1 roo 3 hens. (I lost 2 other hens) so I decided to get a couple More hens. I went with a silver Dorking and 2 Orpington maran cross hens. The new birds are only about 3-4 months it appears (only half the size of the rocks) now the problem is it appears that the rocks will not except them into their flock. The 3 newbies always stay together and when the rocks see them the new birds run or get chased. When will this end? They sleep in the same coop but there is usually a pre bedtime scuffle. And the younger birds are not aloud to sleep Next to the rocks haha. Thanks for the help!