Cockatoos screech loudly like banshees. You can't sneak up on them. They are cocky little buggers too. Very clever, and they can be taught to do tricks, or they do funny things out in the wild, like hanging upside down off a tree branch and swinging to and fro. Nature's clowns of the air. If they are flying way up high you just hear that raucous, unmusical squawk and wonder where it is coming from.

Budgies in Oz are budgerigars - small birds, usually minding their own business and not bothering anyone but they can set up a screech if they are disturbed by someone or something.