I have 4 silkies-a white, a black and 2 blues. My black silkie is a hen for sure....sweetest little fluff ball with barely an comb or wattles. The grays look to both be roos. One is crowing and the other seems to look identical in regards to tail feathers and a red tint to the comb and wattles. But my white....I go back and forth with daily. Pearl was the largest of them all since Day 1. S/he is very fluff, tail included, and I don't notice any red to the comb or wattles. The main thing that leads me to believe we may have another roo is that s/he has random thin feathers spiking out the back of her head. They are soft, not stiff. I see them blowing in the wind usually. ;-) What else can I look for? They should start laying any day. My other "big girls" have been laying for a month and a half and they were exactly 4 weeks older. The Buff Orp from this batch has begun laying about 2 weeks ago, but the other bantams have not.