So I have 8... some have started laying. All is well until tonight, my normally very reserved Black Australorp (Zsa Zsa) mounts my Barred Rock (Penny) in what appears to be mating. I am new to this and have never seen chickens mate, but I think it's a pretty good guess. So far, no crowing out of anyone. Do I definitely have a ROO, or is that pecking order behavior? She is normally quite and reserved. The only one that doesn't really require any attention or want to get in my lap. Stays on the out-skirts of things. Not a sound. Big in size, but no other obvious signs.