Is there a way to know w/Silkies?

[buzymom13]

I got 6 silkies from TSC (straight run) to be buddies w/my 1 and only hatched peep. One of the silkies didn't make it and my peep that I hatched out died yesterday... I was most upset. But now I have 5 silkies...

Is there any way to know roo from hen in silkies? I looked at their wings and they all seem to have the same double feathering on the wings. Any advice would be appreciated.