Neornithes Gadow, 1893 - living birds
   Palaeognathae - palaeognaths see Cohort Palaeognathae Pycraft, 1900
     ratites see Subcohort Ratitae Merrem, 1813
       Family Struthionidae Batsch, 1788 - ostriches
         Genus Struthio Linnaeus, 1758 [monotypic]
           Struthio camelus Linnaeus, 1758 - ostrich
             1 ‡?Struthio camelus syriacus Rothschild, 1919 - Arabian ostrich
             2 Struthio camelus camelusᵀ Linnaeus, 1758 - African ostrich
             3 Struthio camelus molybdophanes Reichenow, 1883 - Somali ostrich
             4 Struthio camelus massaicus Neumann, 1898
             5 Struthio camelus australis Gurney, 1868