I got 8 chicks out of the bantam box at tsc they all look exactly the same white, silky feathering, blackish blue skin. but half of them have the walnut comb and the other have single combs. the chicks are two weeks old plus, so I can see there combs very well. if a single comb is not silky then what breed could these single combed ones be? and how do you tell the sex of silky's at 2 weeks of age.