I have 11 silkies that are about 6 months old. Of those, 5 are roosters. Only 2 of the roos have seemed to become "real" roos and act studly. The other 3 seem to not have developed the walnuts on their heads, and don't really act like roos. They are just sweet and bother nobody. Is this common? I am actually thrilled, because I was worried about having probs with too many roos in the flock, and don't want to part with any of them. When I ordered them as day old chicks, I ended up with too many roos despite paying extra to have them sexed and more girls sent. It just came out this way.....OOPS!! I love them all and parting with any of them will never happen. They will all die of old age.