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Cockatoo Face

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Cockatoo Face

The relationships among various cockatoo genera are largely resolved,[8][9][11][12][20][21] although the placement of the cockatiel (Nymphicus hollandicus) at the base of the cockatoos remains uncertain. The cockatiel is alternatively placed basal to all other cockatoo species,[8][20] as the sister taxon to the black cockatoo species of the genus Calyptorhynchus[11][12][21] or as the sister taxon to a clade consisting of the white and pink cockatoo genera as well as the palm cockatoo.[9] The remaining species are within two main clades, one consisting of the black species of the genus Calyptorhynchus while the other contains the remaining species.[8][9][11][20][21] According to most authorities, the second clade includes the black palm cockatoo (Probosciger), the grey and reddish galah (Eolophus), the gang-gang cockatoo (Callocephalon) and the pinkish Major Mitchell's cockatoo (Lophochroa),[8][9][11][20] although Probosciger is sometimes placed basal to all other species.[12] The remaining species are mainly white or slightly pinkish and all belong to the genus Cacatua.[8][9][10][11][20] The genera Eolophus, Lophochroa and Cacatua are hypomelanistic. The genus Cacatua is further subdivided into the subgenera Licmetis, commonly known as corellas, and Cacatua, referred to as white cockatoos.[8][12][20][21][22] Confusingly, the term "white cockatoo" has also been applied to the whole genus.[23][24] The five cockatoo species of the genus Calyptorhynchus are commonly known as black cockatoos,[22] and are divided into two subgenera—Calyptorhynchus and Zanda. The former group are sexually dichromatic, with the females having prominently barred plumage.[25] The two are also distinguished by differences in the food-begging calls of juveniles.
source: https://en.wikipedia.org/wiki/Cockatoo

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