Hi, I started a small garden in my backyard and decided to get chickens. I am very nervous but excited about this idea. So far they are 5 weeks old and I just put them out into their outside coop. I have 3 Americaunas from what I was told at the feed store. I am stressing because one of my chickens is much larger than the other two and I don't know if it is a rooster or just a big chicken. I come from NYC and know nothing about chickens or gardening. I have just been reading alot and trying to follow instructions. How do I know if I have a rooster?