I have 15 Ameraucanas that are almost 14 wks old. I read about the tails/no tails method, either on this board or on the EE sexing link, and I thought I would try it. I have received a couple of affirmations from long time chicken folks that it works. I sorted mine at one week to 6 with no tails,one questionable and 9 tails, ie hens. I identified 3 blues, 1 lavender, 1 blue wheaten/wheaten and I do not remember the other, I think possibly a black. At this time, I can positively identify the 3 blues, the lavender and the blue wheaten. I am still waiting to confirm if there is 1 or 2 more, or if there is just five.Good luck with that. I'm still guessing on my 6 wk old ameraucana chicks!