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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.
The cockatiel is a specific species within the bird family commonly called cockatoo. There are 21 species of cockatoos within the family of birds Cacatuidae, and cockatiels are the only members of the Nymphicus genus.Cockatiels are the smallest birds in the cockatoo family and are one of the most popular pet birds.he most obvious way to discern a cockatiel from other cockatoos is the size difference. Cockatiels are about half the size of other cockatoos and have much smaller beaks.