We've all seen Parrot's squak, whistle, and, sometimes say something.  Usually, I'm not sure what they're saying because it sounds like noise to me.

But, when a parrot sings, now that's a 'horse of a different color.'

Sure, they could say, or sing,  "Polly, wanna cracker," but is very incredible when a parrot sings  "Yo Ho (A Pirate's Life For Me)?"

That's amazing!  Wonder what his next song will be?