Just going to paste what I posted elsewhere:
"I have/had 3 bronze wing pis and only Apache, my 3 year old male talks. He says "bisou, bisou" and makes kissy noises, "coucou Apache" or "coucou, ça vas?" "tut, tut, tut" clucking toungue noises when he's being naughty or just overexcited and a lot of robotic mumbling.
oh and a "tut, tut, tut... graaawww" while i'm playing at catching his toes. The growl is when I touch him or he gets my finger. It's the: " it's coming... coming... coming... got youuuu!" game. Silly bird. He also does a perfect imitation of the "hoooo" sound I make when I think he's doing or saying something interesting. So cute!
He loves to whistle to. Our contact call is a wolf whistle and my young pi uses it to, even when they're calling each other. I don't expect him to learn a lot of new words because he's learnt what he knows as a baby and doesn't seem interested in saying more. He does use them in context though.
He's always had a thing for human language, he started mumbling to himself during his first week home and quickly picked up a few words and sounds."