My Cuckoo Marans are five days old. How soon should I be able to tell the boys from the girls? Do I have to wait till their feathers have all grown in or is the baby fluff color indicitave of sex as well? I have one who is way lighter than the others who I have assumed is a roo's but there are two in between the darkest "girl" and the lightest "roo". Here is a picture with the "roo" on the left. By the way they did NOT like the camera!