Hi! My 4 girls a are 15 1/2 weeks old. 2 of them are Buff Orpingtons. Beatrice is bigger than her sister Ethel, and has a larger crown which is much redder. Also, she's recently developed wattles that are red. Ethel doesn't have any wattles at all. Do I have a rooster in the mix? I've only been doing this since they were a day old, so I'm not sure what to look for! There's been no crowing yet, they all still sound the same. Please help!