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 Tockus Lesson, 1830
             01 Tockus alboterminatus (Büttikofer, 1889) - crowned hornbill
             02 Tockus bradfieldi (Roberts, 1930) - Bradfield's hornbill
             03 Tockus fasciatus (Shaw, 1811) - African pied hornbill
             04 Tockus hemprichii (Ehrenberg, 1833) - Hemprich's hornbill
             05 Tockus pallidirostris (Hartlaub & Finsch, 1870) - pale-billed hornbill
             06 Tockus nasutus (C. Linnaeus, 1766) - African grey hornbill
             07 Tockus monteiri Hartlaub, 1865 - Monteiro's hornbill
             08 Tockus erythrorhynchus (Temminck, 1823) - red-billed hornbill
             09 Tockus leucomelas (M.H.K. Lichtenstein, 1842) - southern yellow-billed hornbill
             10 Tockus flavirostris (Rüppell, 1835) - eastern yellow-billed hornbill
             11 Tockus deckeni (Cabanis, 1869) - Von der Decken's hornbill
             12 Tockus jacksoni (Ogilvie-Grant, 1891) - Jackson's hornbill
             13 Tockus hartlaubi Gould, 1861 - black dwarf hornbill
             14 Tockus camurus Cassin, 1857 - red-billed dwarf hornbill