I've got five 15 week old hens (4 easter eggers, and a buff orpington) and one 15 week old easter egger rooster. They've been living in the 4 ft wide, 5 ft high, 8 ft long coop since they were 6 weeks old. Two weeks ago, I put five more easter egger hens that are 6 weeks old in a wire cage and put it in the coop, so all the chickens could do the see but don't touch thing to become introduce. Today, I let the youngsters out of their wire cage. A few hours later, I put them back in their wire cage, because the older chickens (especially the rooster) were pecking at them so badly, I became worried about their safety. Am I just being an over worried mommy? Is this just "figuring out pecking order"? Or, are the bigger chickens trying to kill them? There's quite a size difference, and I'm wondering if the youngsters are just too small to defend themselves yet. The coop ought to be large enough for all of them, plenty of roosting space, etc.