Hello All, I'm a new member. I have three 4 month old chickens and suspect that one is a rooster. She just started crowing this week and has always been the most aggressive of the 3 - running straight at the other chickens with feathers puffed up. She's a Columbian Wyandotte and I've attached pictures taken yesterday. She's kind of a pain but we still love her and hope she's not a rooster so we can keep her. Any thoughts are appreciated! Thanks!