Subclass Avialae Gauthier, 1986 see Clade Avialae Gauthier 1986
Count: [o] 31o;113f; ‡2o;6f; †11o;14f
   Infraclass Aves Linnaeus, 1758 see Subclass Aves Linnaeus, 1758
  Count: [o] 31o;113f; ‡2o;6f; †11o;14f
     Parvclass Neornithes Gadow, 1893 see Subclass Neornithes Gadow, 1893
    Count: [o] 31o;113f; ‡2o;6f; †4o;7f
       Cohort Neognathae Pycraft, 1900
      Count: [o] 27o;107f; ‡3f; †4o;7f
         Subcohort Neoaves Sibley et al., 1988
        Count: [o] 25o;99f; ‡2f; †2o;4f
           Division Terrestrornithes B.C. Livezey & R.L. Zusi, 2007
          Count: [o] 17o;78f; ‡2f; †1o;3f
             Subdivision Dendrornithes Verheyen, 1961
            Count: [o] 13o;50f; ‡1f; †1o;1f
               Section Anomalogonates Garrod, 1874
              Count: [o] 11o;43f; ‡1f; †1o;1f
                 Subsection Coccyges Huxley, 1867
                Count: [f†f] 4o;9f; ‡1f
                   Superorder Psittacimorphae Huxley, 1867
                  Count: [f†f] 2o;6f; ‡1f
                     Order Psittaciformes Wagler, 1830 - parrots
                    Count: [f] 4f
                       Family Cacatuidae Gray, 1840
                      Count: -