I have 8 Rhode Island Reds and I cant tell which is which. 1 is suppose to be a male and the rest female, but quite honestly there are no differences. They are 7 weeks old. I have one who doesnt have any rump feathers at all and is a bit darker and smaller then the rest but that is it. No larger combs or distinguishing waddles or crowing. My Buff Orpingtons i could tell right away. I know i dont have pictures, but is there anyway to tell a big difference?