Parrot's oratory stuns scientists

The finding of a parrot with an almost unparalleled power to communicate with people has brought scientists up short.

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.

He uses words in context, with past, present and future tenses, and is often inventive.

One N'kisi-ism was "flied" for "flew", and another "pretty smell medicine" to describe the aromatherapy oils used by his owner, an artist based in New York.