Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
Count: [s] 23o;144f;2043g;9628s;2127ss; ‡1f;21g;74s;12ss
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
  Count: [s] 23o;144f;2043g;9628s;2127ss; ‡1f;21g;74s;12ss
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
    Count: [s] 21o;139f;2029g;9571s;2115ss; ‡1f;21g;74s;12ss
       Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
      Count: [s] 10o;106f;1787g;8445s;1871ss; ‡1f;18g;69s;9ss
         Superorder Cuculimorphae Sibley et al., 1988
        Count: -
           Order Cuculiformes Wagler, 1830 - cuckoos and plantain-eaters
          Count: [s] 6f;30g;142s;11ss; ‡1s
             Infraorder Crotophagides see Order Cuculiformes Wagler, 1830
            Count: [*] 3f;8g;16s
               Parvorder Opisthocomida see Order Opisthocomiformes L'Herminer, 1837
              Count: [*] 1f;1g;1s
                 Family Opisthocomidae Swainson, 1837 - hoatzins
                Count: [*] 1g;1s
                   Genus Opisthocomus Illiger, 1811
                  Count: [*] 1s
                     Opisthocomus hoazin (Statius Müller, 1776) - hoatzin
                    Count: -