Well three out of four of our 12 week old chickens turned out to be cockerels. We aren't allowed roosters in our town so we had to get rid of them. We added four new pullets on Saturday, a Buff Orpington, Ameraucana, Black Star, and Golden-laced Wyandotte. Two are 9 weeks and two are 8 weeks. I was hoping since they are fairly close in age to the older 12 week old they would all get along but the older girl is pecking the younger ones a lot. She also doesn't want to come out of her coop all day and seems really sad making crying noises. Is there anything I can do to help them along? She is bigger, but not that much bigger so I don't think she will hurt them seriously. Here are a couple pics to compare. Here's the 8 & 9 week olds. Here's the barred rock 12 week old on the left.