So they're only a week old tomorrow, and I know there is much debate over markings and how they may pertain to sexing Barred Rocks. I have one suspect who has a blaze of white across it's head and I read somewhere about feathers on the wings, and their length having something to do with sex? This one has wing feathers that are all about the same length, however the other three have longer feathers. It's quite a distinct difference, but is it definite evidence of a roo? Mind you, a couple of the others are lighter grey in colour so I'm concerned about them as well. So at what age AM I going to be able to tell for sure? Thanks!