Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Psittaciformes Wagler, 1830 - parrots
           Family Psittacidae Illiger, 1811 - cockatoos and parrots
             Subfamily Cacatuinae del Hoyo et al., 2014 see Family Cacatuidae Gray, 1840
               1 Genus Probosciger Kuhl, 1820
               2 Genus Calyptorhynchus Desmarest, 1826
               3 Genus Callocephalon Lesson, 1837
               4 Genus Eolophus Bonaparte, 1854
               5 Genus Cacatua Vieillot, 1817