8 month old Cooper is starting cage aggression. I ignore his ruffled head, eye pining and biting. I say no calmly and carry on cleaning or feeding. His biting is not hard, more of a warning. If I give him my hand and say "come on" he stops the aggression and comes up. I'm concerned about him banging his beak off the cage. He hits it quite hard. He is healthy, happy and steps up, whistles, learning to talk. We are together all the time, he is out of cage most of the time.