My African Grey could talk, yell, sing and whistle and unfortunately imitate bodily functions exactly like everyone in the home that she was in previously - in a loud clear human voice.
Try having a guest over - and peppep would see them go into the bathroom... Here come the noises. She was having a ball embarrassing people
If I ever met them on the street and heard them talk, I would know who they were.
She had a great time doing it, too.
(then she picked up my voice...)