In my opinion, chicks in the brooder is easy street. It's challenging when everyone is getting big and rambunctious. This is my second transition and first transition with a rooster in the coop. The tweens were penned in the big girl's run for two weeks before I put them in the coop one night. At 12 weeks the tweens are smaller than the big gals, but with hurricane season in coastal Texas upon me, I did the deed. My biggest challenge has been with the rooster. He kept on trying to jump on the tweens. One in particular. He's a Welsummer and he's was infatuated with little Penny who also is a Welsummer. The tweens would stay in the coop all day to avoid the child molester. I know nature will take its course, but the rooster was hit with the hose a few times as well as a time out night in the hospital cage to cool his jets. It's been about a 10 days and the kinks are working themselves out. Penny has become less of an obsession to Zombie (the Rooster.) If anyone has a story to share about their transition I would love to hear about others successes and fails. Here are a few picts of the crew and set up. This is a re-purposed shed I bought. I did NOT do the paint job. Penny and Tika Masala like it. My kids coexisting with the big gals. Barbie (the Exchequer) loves her mama.