PPal - with the silkies, 1 has a much much much bigger comb than the others. But I won't 100% say he's a roo until I see eggs, but since I'm probably going to sell them in June, I doubt I'll see eggs! And, no, I state that they're aggressive. Not exploratory pecking like the Orpington. Wings flared, staring me in the eye.. that's aggression. Have to remember that these are just teeny little bitty velociraptors that taste good, but without the fangs/claws.