From (where else), the BBC:
Parrot’s oratory stuns scientists
The bird, a captive African grey called N’kisi, has a vocabulary of 950 words, and shows signs of a sense of humour.
He invents his own words and phrases if he is confronted with novel ideas with which his existing repertoire cannot cope – just as a human child would do.
I bet, though, that his plumage is nowhere near as beautiful as a Norwegian Blue’s …