He mostly does it when he's in his cage. When he's out he's too busy destroying bits of paper I have lying around. I think I've found that he is doing it because he wants something from me. He definitely has me well trained. If he wants to be covered/uncovered, or the light off or he has upturned his food and wants me to refill it... I probably shouldn't have given in so easily. When I got Pepi, he was only tiny and the breeder said he may not be able to fly, so Pepi spent a lot of time sitting on my shoulder and not going anywhere so he didnt need to screech to make noise. Then he learnt to fly but he always came back when I called. Storm was a little bit older when I got him and he can fly awesomely. When he's out of his cage the last thing he wants is to sit quietly when he has a whole room to explore! So without the bonding I had with Pepi, I have spoilt Storm shamelessly and I think I've gotten a loud and demanding bird out of the deal!