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The Raven cockatoos are a separate group as well, with five species that are more related to each other than to all the other cockatoo species. In the graph you can also see that there are two groups of Cacatua species: the bigger species (with Cacatua alba) and the smaller corellas (with Cacatua sanguinea). In this particular phylogenetic tree, the Palm cockatoo ( Probosciger) is the least related to all other species of cockatoos. Species that are less related to each other, will have a common ancestor that is farther up in the tree (to the left) than species that are more closely related. You can determine the relatedness of two species by comparing the length of the bars, less distance between species means more relatedness. In the next graph you can see how all the cockatoo species are related to each other. Eleonora cockatoo (Cacatua galerita eleonora). Galah cockatoo ( Eolophus roseicapilla) Umbrella cockatoo (Cacatua alba) Ducorps corella (Cacatua ducorpsii) Sulphur-Crested Cockatoo (Cacatua galerita).Gang-Gang cockatoo ( Callocephalon fimbriatum).Long Billed-Black cockatoo ( Calyptorhynchus baudinii) – Baudin’s black cockatoo.Short-Billed Black cockatoo ( Calyptorhynchus latirostris) – Carnaby’s black cockatoo.Yellow-Tailed Black Cockatoo ( Calyptorhynchus funereus).Glossy Black Cockatoo ( Calyptorhynchus lathami).

Red-Tailed Black Cockatoo ( Calyptorhynchus banksii).Raven Cockatoos / “Dark Cockatoos” (Calyptorhynchus Species) Long-Billed Corella (C acatua tenuirostris).Citron Crested Cockatoo ( Cacatua sulphurea citrinocristata) (subspecies of Lesser Sulphure-Crested Cockatoo).Lesser Sulphur-Crested Cockatoo ( Cacatua sulphurea).Blue-Eyed Cockatoo ( Cacatua ophthalmica).Moluccan Cockatoo ( Cacatua moluccensis).Major Mitchel’s Cockatoo ( Cacatua leadbeateri).Red-Vented Cockatoo ( Cacatua haematuropygia).Goffins cockatoo or Goffini cockatoo ( Cacatua goffini).Triton cockatoo ( Cacatua galerita triton) (subspecies of Sulphur-Crested Cockatoo).Mathews’ cockatoo ( Cacatua galerita fitzroyi) (subspecies of Sulphur-Crested Cockatoo).Eleonora cockatoo ( Cacatua galerita eleonora) (subspecies of Sulphur-Crested Cockatoo).Sulphur-Crested Cockatoo ( Cacatua galerita).Here I will list all the species and add a link to a page that describes this species more closely. At the bottom of this page you will find a graph of the relatedness of these species. The species of cockatoo can be divided into white cockatoos ( Cacatua species), “dark” cockatoos ( Calyptorhynchus species) and a few other species.

All species occur in Australia, Indonesia and the island around Oceania. Every one of these species has a crest that can be put up or down. There are 21 species of cockatoo in the world.