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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.
They are prized as household pets and companion parrots throughout the world and are relatively easy to breed. As a caged bird, cockatiels are second in popularity only to the budgerigar. The cockatiel is the only member of the genus Nymphicus. It was previously considered a crested parrot or small cockatoo; however, more recent molecular studies have assigned it to its own subfamily, Nymphicinae.