I had no idea that Cockatoos only occur naturally in Australia and nearby islands. I guess the fact that they are bred for pets has made me think they are common. 11 of the 21 species only occur in Australia. 3 occur in both Australia and New Guinea. The other 7 are from Indonesia, New Guinea and some other south Pacific Islands. Some species are black. The Sulphur-Crested Cockatoo is the most common in Australia.
Cockatoos have a movable head crest.
Cockatoos are also an endangered species.