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] Ciconiiformes Bonaparte, 1854
         Family Ardeidae Leach, 1820 - herons, bitterns and egrets
           Subfamily Ardeinae Leach, 1820
             Genus Nyctanassa Stejneger, 1887 [monotypic]
               Nyctanassa violacea (Linnaeus, 1758) - yellow-crowned night heron
                 1 Nyctanassa violacea violacea (Linnaeus, 1758)
                 2 Nyctanassa violacea bancrofti Huey, 1927
                 3 Nyctanassa violacea caliginis Wetmore, 1946
                 4 Nyctanassa violacea cayennensis (Gmelin, 1789)
                 5 Nyctanassa violacea pauper (Sclater & Salvin, 1870)