This deals with American Gamefowl.
Following photographs illustrate appearance of an advanced juvenile relative to a chick about to start juvenile phase (age differs by 11 weeks). They are full-sibling males that will look very similar as adults.
Advanced juvenile has most of his adult wing flight feathers in but all of his flight tail feathers are juvenile and will be replaced over the next 45 days. The few remaining juvenile wing flight secondaries are visible with the bars as well as are shorter, more flexible and have pointy tips.
The chicks feathers are even pointier than the juvenile feathers and the base coloration is lighter with stronger pattern that is visually disruptive (camouflage). Note how tail feathers are hooked like in juvenile but coloration and tips different. Chick also showing the start of juvenile body feathers coming in on his head and neck.
Following photographs illustrate appearance of an advanced juvenile relative to a chick about to start juvenile phase (age differs by 11 weeks). They are full-sibling males that will look very similar as adults.
Advanced juvenile has most of his adult wing flight feathers in but all of his flight tail feathers are juvenile and will be replaced over the next 45 days. The few remaining juvenile wing flight secondaries are visible with the bars as well as are shorter, more flexible and have pointy tips.
The chicks feathers are even pointier than the juvenile feathers and the base coloration is lighter with stronger pattern that is visually disruptive (camouflage). Note how tail feathers are hooked like in juvenile but coloration and tips different. Chick also showing the start of juvenile body feathers coming in on his head and neck.