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] Coraciiformes Forbes, 1884 - rollerlike birds
         Family Bucerotidae Vigors - hornbills
           Genus Buceros Linnaeus, 1758
             1 Buceros bicornis Linnaeus, 1758 - great hornbill
             2 Buceros rhinoceros Linnaeus, 1758 - rhinoceros hornbill
             3 Buceros hydrocorax Linnaeus, 1766 - rufous hornbill