Rosie (left) is one of ~30 week old birds, next to her sister Wilma, also a RIR. we bought the pair at ~13 weeks. Rosie has been acting the boss of the coop, and has even mounted the other hens. Rosie has never cock-a-doodle-doo-ed, but can be very vocals at time. Size wise, Rosie is our biggest bird. Rosie's sister Wilma seems a little runty, but that's another problem. I've been looking at pictures of other RIR hens, and I know the hens can get green tail feathers (Wilma has a few), but Rosie also has a few green feathers on her cowl, especially along her spine. The comb, jowls and ears just keep seeming to get bigger ever day. So, cock or hen?