Class [Mammalia] Linnaeus, 1758 - mammals
   Order Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
     Family Bovidae Gray, 1821 - antelope, cattle, bison, buffalo, goats, and sheep
       Genus Madoqua Ogilby, 1837 - dik-diks
         1 Madoqua guentheri Thomas, 1894 - Gunther's dik-dik see Madoqua guentheri Thomas, 1894
         2 Madoqua kirkii (Günther, 1880) - Kirk's dik-dik see Madoqua kirkii Günther, 1880
         3 Madoqua piacentinii Drake-Brockman, 1911
         4 Madoqua saltiana (Desmarest, 1816) - Salt's dik-dik