I had an African Grey years ago... He wasn't hand raised and not very nice.
He was Awesome at sounds mostly, like the cat meowing or the telephone ring
Drove us crazy with running to get the phone and it being him he was so good.
He used to cat call whistle real loud and got me in trouble once when I was outside and he whistled right when 2 women were walking down the street.
They gave me a dirty look thinking it was me.