I brokered a Hyacinth Macaw to an Italian guy in NYC once. "Vegas" was a two year old and full of inquisitive mischeif. That is totally normal for an adolescent bird that is outgown by age 3 or so. Frank on the other hand was high strung and short on patience. Now mind you, this is an $8000.00 bird. They are the largest, most beautiful, and one of the most endangered birds on the planet. They can also live in excess of 100 years. So, I was quite surprised when Frank called me begging for me to take the bird back.
I agreed to take him back for some behavior modification. It seems that Vegas screamed and bit Frank. Well, there was nothing wrong with Vegas. He just needed a routine, attention, and discipline stuff like time outs.
After about a week, Vegas learned to channel his intelligence (which is on the order of a three year old child, dolphine, or primate) into more constructive things like planning complicated tricks to play on my dogs, and girlfriend. Once, I gave him a treat. He waited until I sat down to watch TV. Then, he whistled exactly like I do when I call the dogs. When the dogs came running all floppy-eared and happy, Vegas slung the treat out to them, watched them fight over it, and started a low wicked laugh that got increasing louder and more hysterical. He stopped immediately when I looked at him. It was as if he was commucating to me, "See what simpletons your other pets are".
I kept Vegas for 3 months (srtictly for behavior modification purposes of course) Frank and Vegas are really happy now. Frank even converted a spare room into a play area for Vegas and his other two macaws. The link below is a picture of my breeding pair of Hyacints"Bonnie and Clyde" . If you've never seen a Hyacinth, they are quite a sight to behold.
http://www.junglenest.com/Hyacinth-Macaw.html
http://www.junglenest.com/images/Parrot_Img/hyacinth.jpg