I have 12 black australorp chicks that I got from TS...they are doing well but I'm wondering, about half have already developed wing feathers and the other half or so are developing more slowly...is there a method to tell which ones are roosters versus hens with this? I know it may not be full proof but wondering. I also have 3 new hampshire reds, a few days olders than the BAs but they all are evenly feathered...their wings are coming in but not hugely. I know it varies from breed to breed but does anyone know?