When I was taking care of my chicks/chickens, I noticed one of my 3 week old Easter eggers has a naked back. I don't see anything wrong with her. It's this something to be concerned about? As a side note, I also have 6 week old Orpingtons. At what point can I put them together? One got out the other day when I was cleaning their box and the Orpingtons went on the attack. I saved her before they got to her but now I don't know when it's ok?