Today I put my (6) 18 week old ee in with my 3 white leghorns (1 roo) and 4 Rhode Island Reds. They are about the same size. As part of the process, I put the small coop right beside the adult's run. They have been there for a couple months (see but no touch). I put some scratch treats and hay into the run prior to integration. My roo was awful. I took him out and put him into the little coop by himself because he was just downright being nasty. My hens are not behaving much better, but really only attack when one gets close to them. I am questioning if I made the transition correctly. I read hiding places? Maybe a board leaned up against the run fence? Ahh I don't know if I made the right decision.