I have Buff Orpingtons, Plymouth Rocks, and Ameraucanas (3 of each) that are about 3 weeks old. I've noticed that some have a bigger comb than others. I was wondering if I got some roosters in my batch that are supossed to be all hens. Is it just plain too early to tell? Are they supposed to look like that? How can I tell the sex (besides vent sexing)?