I raised 30-some chicks of various breeds this year. They're nearly 6 months old. I landed with about 15 cockerels. One male has claimed dominance. His waddles are huge, full, and flush, he stands tall, and is the *only* one that crows. All other males are quiet, with small waddles. Only two or three of them breed the hens. No fighting or over breeding issues. My friend, who raised a similar quantity of birds, many from the same breeders though she had more variety than I, landed 50% cockerels. However she's had to cull several due to extreme aggression both between the roos, as well as too violence against the hens. ALL of her roos crow. Our birds both free range and are kept very similarly. Any ideas as to the massive difference in behavior?