Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           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 Gruiformes Bonaparte, 1854
                   Suborder Grues Bonaparte, 1854 - cranes, limpkins, trumpeters
                     01 Family †Geranoididae Wetmore, 1933
                     02 Family †Eogruidae Wetmore, 1934
                     03 Family †Ergilornithidae Kozlova
                     04 Family †Eleutherornithidae Wetmore
                     05 Family Gruidae Vigors, 1825 - cranes
                     06 Family Aramidae Bonaparte, 1849 - limpkins
                     07 Family Psophiidae Bonaparte, 1831 - trumpeters
                     08 Family Heliornithidae Gray, 1841 - finfoots
                     09 Family Rhynochetidae Newton, 1868 - kagu
                     10 Family Eurypygidae Selby, 1840 - sunbittern
                     11 Family Mesitornithidae Wetmore, 1960 - mesites