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 Botaurinae Bock, 1956
             Genus Ixobrychus Billberg, 1828
               1 Ixobrychus involucris (Vieillot, 1823) - stripe-backed bittern
               2 Ixobrychus exilis (Gmelin, 1789) - least bittern
               3 Ixobrychus minutus (Linnaeus, 1766) - little bittern
               4 ‡Ixobrychus novaezelandiae (Purdie, 1871) - New Zealand bittern
               5 Ixobrychus sinensis (Gmelin, 1789) - yellow bittern
               6 Ixobrychus eurhythmus (Swinhoe, 1873) - Schrenk's bittern
               7 Ixobrychus cinnamomeus (Gmelin, 1789) - cinnamon bittern
               8 Ixobrychus sturmii (Wagler, 1827) - dwarf bittern