We are new to chickens and bought a few from a friend. He bought an assorted group and they are in the 16-17 week age group. One of barred rocks has a larger comb already but seems to be missing some of the other features? We were discussing this tonight and I only have some random pictures. I can try to get better ones tomorrow. I have no idea if the one with the comb is the same age or older than the other with no comb. Our concern is that it could be a rooster but after looking at pictures it seem as though some hens just have a larger comb? Any input would be appreciated.