how the HECK do I tell Light Brahma genders apart?

[Chicken Fruit]

I have 5 week old chicks, someone SHOULD be a roo... one of them ACTS like a roo and is routinely sought out by the EE and maran roo of the same age for sparring matches.. however really they all look alike!


AHHH!!! is it JUST the tail feathers or something? When will they get green ones in for the roos?

this seems to impossible.

 

[SundownWaterfowl]

Mine are about 9-10 weeks and 12-13 weeks old, and I can tell the genders. Post some pics.