I have been observing some red jungle fowl x American games going through the process of growing up in a free-range setting. They were raised by mother (red jungle fowl) for first 5 weeks and then tended until about 12 weeks by father (American game) as a combined group with half-sibling full games of similar age. Pure juvenile games were harvested at 14 weeks leaving the hybrids with rooster. At about 18 weeks the hybrids began mix with other groups but on most nights returned to roost with father. The three cockerels now about 22 weeks are beginning to fight more. When facing off with hackles extended they are making crowing like sounds that pure games of any age do not make. Has anyone ever seen such behavior?