I adopted Max 3 weeks ago from a friend's mother.
Max is an 11 year old cockatiel.
Max is extremely angry about 90% of the time. Sometimes he will "mutter" or chatter real fast then it builds up into screaming for hours on end. I've tried covering his cage at night and uncovering it at 6 a.m. I've tried sitting beside his cage for several hours a day talking to him. I've tried leaving the radio on when I have to leave. I've tried setting him outside for a few hours. And today I am just fed up with his screaming. The neighbors are complaining about the constant noise. It sounds like Max is being tortured.
What else can I do for him?