Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 1; Count: [s] 23o;144f;2043g;9628s;2127ss; ‡1f;21g;74s;12ss
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
  Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 1; Count: [s] 23o;144f;2043g;9628s;2127ss; ‡1f;21g;74s;12ss
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
    Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 3; Count: [s] 21o;139f;2029g;9571s;2115ss; ‡1f;21g;74s;12ss
       Parvclass Coraciae see Order Coraciiformes Forbes, 1884
      Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 32; Count: [s] 5o;17f;67g;309s;58ss
         Superorder Bucerotimorphae see Suborder Bucerotes Fürbringer, 1888
        Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 33; Count: [s] 2o;5f;12g;66s;10ss
           Order Upupiformes see Infraorder Upupides Seebohm, 1890
          Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 35; Count: [s] 3f;3g;10s;4ss
             1 Infraorder Upupides Seebohm, 1890
            Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 35; Count: -
             2 Infraorder Phoeniculides see Infraorder Upupides Seebohm, 1890
            Ref: B.L. Monroe Jr. & C.G. Sibley, 1993: 35; Count: [s] 2f;2g;8s;2ss