Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       Order [Psittaciformes] Wagler, 1830 [monotypic] - 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 [monotypic]
             2 Genus Calyptorhynchus Desmarest, 1826
             3 Genus Callocephalon Lesson, 1837 [monotypic]
             4 Genus Eolophus Bonaparte, 1854 [monotypic]
             5 Genus Cacatua Vieillot, 1817
             6 Genus Nymphicus Wagler, 1832 [monotypic]