I have three silkies, two black and one white. I know almost nothing about silkies. I raised them from babies so I can hatch eggs. Anyway how do I tell which would be male or female. They are about six months old. None are crowing but I don't know how fast they develop. Is there a way to look at crests? Also my white silkies seems to have more blue type wattles than black. Is this normal? Any replies would be appreciated.