So I have several chickens that are about 20 weeks old. One I'm certain is a roo, he is crowing and herds the other girls around. there is another though that is also significantly smaller than the rest (like the other roo) that I suspect is a roo also. thoughts? Above you see two silverlace the smaller one is the one I question. All three here are the same age. up close. fit nicely in my hand still.....???? are there "runt" chickens?