I'm raising a brood of Jersey Black Giant chicks that are 3 weeks old, and I also have some Australorp babies. Some of my Jersey Black Giant chicks have a barred black-and-white pattern on their wings and back, whereas others are pretty much all black. The ones with the barred pattern are among my suspected little roos, because their combs are a bit on the large side. So, I was wondering if there are sex-linked feather color patterns in these breeds that make it easy to tell the roos from the pullets, or is the pattern just a random thing? Sorry I don't have a pic right now - I misplaced the camera upload gadget.