At what point would you be able to sex Columbian Rocks? I have three of them, two are about 8 weeks old and one is a little younger. Here are the two older ones: Don't know about you, but this one seems to be screaming cockerel... This is the one I am unsure about. These are my younger white rocks. I think maybe they are a pair? One has red wattles and one doesn't. I didn't get a picture of the younger columbian one. It has a large comb though, so I'm guessing it's another roo. Time will tell!