So I have an EE cockrel (that was supposed to be a pullet!) who is pretty mean to my other birds. About a week ago he started going up to the other chicks (but not my Wellie cockerel) and grabbing them by the neck and biting really hard for several seconds. He doesn't pull out any feathers or draw blood, but the other chick starts squawking bloody murder when he bites them. Is this normal pecking order behavior, or is this typical adolescent cockerel behavior? I haven't noticed any of my other birds doing this to one another. They do peck each other every now and then and posture some, but he's definitely the most aggressive.