I have 11 Ameraucanas that are about 10wks old. I am having a really hard time deciding who is a pullet and who is a roo... So, while they were free ranging today, I decided to crow (I am pretty good at getting roos to 'answer' me..)hoping that maybe ONE of the roos would answer... So, I let it rip--well -- it didn't go as I had planned...the big girls hauled tail to their coop, knocking the little chicks down who were running to and fro trying to find shelter--from the horrible monster! EVERYONE was in panic mode! you have never seen 18 chickens of all ages, sizes and colors moving in so many different directions, @ such a high rate of speed!! I felt so stupid, I was very glad NO one else was there to witness it! The chickens forgave me and resumed their daily free range! But Ruby, my favorite RIR, kept looking at me and fussing in a low voice....as if to say---"you are one crazy human"!