I have a buff orp who is 5 weeks old. She (he?) has a comb and wattles, but I think this is one of those breeds where both sexes do, right? The thing is, her legs are heavier than the other chicks' legs (thicker), and she keeps trying to jump on them. She's also bigger than they are. Could this be just a dominance issue? Is she just more developed than they are? Is there any way to tell?