I have a black silkie that hatched in June that I thought was a pullet until I saw her mount another pullet (white cross breed) yesterday. The reason I thought it was a she is because she makes the same 'Brock Brock Brock' noise as the rest of my hens and has never crowed. The black silkie and the white cross breed are at the very bottom of the pecking order and stay away from my other layers (white leghorns and red sex links). I recently put 3 new babies in a pen next to rest of them and 1 of them is definitely a roo, crows, puffs up, and protects the other 2 babies. How can I tell if my black silkie is a roo or not??