I have 3 Light brahma chickens. One is a hen (18mo) and two are just shy of 5 months. We've started noticing that one adolescent is different than the other! It has pointy neck feathers and it's tail feathers are starting to point down. It's also HUGE in comparison to the other younger LB. we've caught her fluffing up in defense against older hens who might pick but I got to looking at her today and really started making observations. I've only been keeping chickens for 18mo so I'm still learning. I wouldn't mind a roo!