I have 2 Silkie chicks 12 weeks old, I thought they were both Roo's due to a noise they make that sounded like they were trying to crow.... but I have been looking at allot of Silkie pic's and I have noticed that they are not getting the "ribbons" in their tails like all the Roo's I have seen pic's of. Is it too soon? am I jumping the gun, or do I have some messed up Roo's?