I have six SS chicks that are about 12 weeks old, hatched from eggs given to me by a friend. I'm pretty sure that I've got 50% roos. I took this photograph a few minutes ago, the chicks on the left I'm assuming (from loads of research) are cockerels. I'm also guessing the ones on the right with no combs at all.. pullets. I know that sometimes chicks develop at different rates so.. I'm hoping for other opinions. I'm a first time chicken-mama, so this is all new to me. Thanks much!