As silkies get older, do the males and females develop a noticeable difference in size? I had two that I posted pics of here a while back and everyone assumed they were both roos. But now I'm noticing that one is significantly larger than the other. They live together, so they have the same diet. And they were hatched on the same day, so they're definitely the same age. But one is wider, taller, and thicker than the other now. They're just under 3 months old, so could this be a sign of a gender difference?