I have one chick (2 1/2) weeks who is different from the rest, and I'm wondering if she (he?) might be a roo. (They were supposed to all be females, from My Pet Chicken.) Since day one this chick has been the most aggressive, though not bullying, just running toward everything that enters the brooder to peck it (even when the others run away). The chick is of the smaller breed (Delaware) than the others (Orps & Australorps), but is the most vocal, energetic, and forward toward me. Has also earned the nickname Alcatraz, as she/he has figured out how to regularly fly out of the cage when I open it, something that no one else has done. Seems hell-bent on getting out, though more for the sake of being out in front than anything else. Thoughts? Can you tell a roo by behavior as a young chick?