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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.
As a species, cockatiels are actually small parrots and only 1 of approximately 340 different species of parrots. The name cockatiel is a derivative of the Dutch word Kakatielje which means little cockatoo. DNA research (UC-Davis, 1997) has proven that cockatiels really do belong to one of the cockatoo families.