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Cockatoos are recognisable by the showy crests and curved bills. Their plumage is generally less colourful than that of other parrots, being mainly white, grey or black and often with coloured features in the crest, cheeks or tail. On average they are larger than other parrots; however, the Cockatiel, the smallest cockatoo species, is a small bird.

From Wikipedia, the free encyclopedia http:/​/​en.​wikipedia.​org/​wiki/​Cacatuidae
Cacatua galerita - Sulphur-crested CockatooCacatua leadbeateri - Major Mitchells CockatooCacatua sanguinea - Little CorellaCacatua tenuirostris - Long-billed CorellaCallocephalon fimbriatum - Gang-gang CockatooCalyptorhynchus banksii - Red-tailed Black CockatooCalyptorhynchus funereus - Yellow-tailed Black CockatooCalyptorhynchus latirostris - Short-billed Black CockatooEolophus roseicapilla - GalahNymphicus hollandicus - Cockatiel