I have fifteen 3 week old Ameraucanas. One of them just HAS to be a roo, I just know it. Everytime I pick up a chick (and they ALWAYS cry like I am killing them) he runs up close to my hand and watches...but all the others are running and hiding. He hasn't tried attacking or anything but he is very concerned for the chick I picked up. lol It's actually quite cute. I am just wondering if, from experience, you've noticed that aggressive roos were aggressive even when they were quite young. He's been doing this since a week old.