These are my older chicks. They are roughly 3 weeks old. I figure 2 are boys since the darkest one and one of the darker buff chicks are a bit larger and have 2xs the comb size than the other 4 chicks. They are in with our oldest Black orpington - Boy?. He too has a much larger comb and his legs are so HUGE! - and our RIR/Barred rock - also boy?. The dark possible boy... Orpington chick - big boy!