I got 6 chicks from a from a local farmer on Oct. 20, 2014. 3 where 3-4 weeks old, and the other 3 5-6 weeks old. 2 of the bigger ones have good size combs already and 1 does not. 2 of the smaller ones have combs and the 3rd does not. Can someone plz tell me if these are roos or hens. NONE of them have even attempted to crow and they should be about 13 and 16 weeks old. They are a mix of Blue orps,Jubilee Orps and Breda. Thank you much .