I've heard that at a cpl weeks old you can tell gender by tail feathers. I have 3 black australorps and 1 has very pronounced tail feathers and the other 2 do not. Is this accurate? All my other chicks (golden comets and road island reds) have pronounced tail feathers as well. I know I'll know more for sure at 6 weeks, chicks are just under 3 weeks right now, but just curious.