Wow, he could whistle the tune for the Andy Griffin show...that is amazing!
I had a cockatail 25 years ago. Polly would walk back and forth bopping his head up and down whistling to the tune of Yankee Doodle in front of the mantle mirror. Everyone got a kick out of watching him. Cockatails are very talented birds and make great companions.
Thanks for posting his picture up, he was a beautiful bird. he reminded me of my Polly bird. Polly was also a male ( bright yellow)
I hope as time goes by you consider getting another bird, you would give it a wonderful home and companionship.
I know you miss your bird very much, again I am sorry.
Shalom - Dox