I have ten eleven week old chicks. I got eight of them as day old chicks and then added two more Buff Orpingtons from the same hatch at nine and a half weeks. I expected the newbies to shake up the pecking order a bit, but although they all do roost together the new BOs are constantly harassed during waking hours and spend most of their time keeping a good distance from their would-be flock mates. There is no serious violence, but I've heard that in these situations the new chicks might never fully integrate and could remain outsiders. Anyone have any luck with birds this young coming together as a flock. They spend most of their time in a 15' x 30' run but occasionally free range with supervision as we have a heavy predator population this year. They were segregated for the first five days for their own safety, but once turned loose with the flock they pretty much just stick with each other to avoid getting pecked.