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Animals & Nature. Cockatoos (Cacatuidae) are a group of parrots that include cockatiels, cockatoos and corellas. There are a total of 21 species in the cockatoo family, most of which inhabit Australia, the Philippines, several eastern Indonesian islands. Cockatoos are notable for their elaborate crest plumage.
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. The phylogenetic position of the cockatiel remains unresolved, other than that it is one of the earliest offshoots of the cockatoo lineage.