I have some Blue Marans (not Blue Copper, just Blue). They are two weeks old. My Black Copper boys are starting to show some copper in their wings. Since my Blues don't do that, I've been looking at other possibilities for sexing them. I noticed there is a marked difference in leg color for most of them. Would the more yellow be boys and the darker, more blue, be girls? Or what are your thoughts? Pic shows one leg of each color.