My 6 mo. old Linnie has just become a little monster, he shares a double flight cage with another male 10 mo. old. The 6 mo. old has started to scream and attack me, he has gotten very territorial and even when out of the cage has tried to attack me when I walked in front of him as he was sitting on top of his cage. Is this something that will pass with age? He has been to the vet and there are no medical issues. I have so far tried to ignore the behavior and when I open his cage I make sure that I have something in hand that he can bite into, like a piece of broccoli instaed of me. Has anyone experienced this type of behavior?