Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
       Subfamily Sciurinae Batsch, 1788 - tree and ground squirrels
         Genus Protoxerus Forsyth Major, 1893 - African giant squirrels
           1 Protoxerus aubinni - slender-tailed giant squirrel see Protoxerus aubinnii Gray, 1873
           2 Protoxerus stangeri (Waterhouse, 1843) - giant forest squirrel