660 AFRICAN GAME ANIMALS 



with a surface made up of ridges separated by open valleys. 

 Such a tooth structure is capable of masticating the softer 

 food of a browsing animal, but is less able to stand the 

 wear which a grass diet would demand. The recently ex- 

 tinct woolly rhinoceros was in some respects like the white, 

 being a long-headed, long-toothed form, but it had a very 

 peculiar snout, the nasal bones curving downward and unit- 

 ing with the premaxillary in a solid, bony mass. This sort 

 of structure gave it a long ridge-like or compressed base to 

 the front horn, which projected forward, owing to the down- 

 ward curvature of the nasal bones upon which it rested. 

 Some naturalists have suggested a close blood relationship 

 between the woolly and the white, but they are really only 

 remotely related. The white rhinoceros resembles its geo- 

 graphical associate, the black, in having two horns and 

 lacking both incisor and canine teeth. The white rhinoc- 

 eros is doubtless, like the black, a form which has had its 

 origin on the continent on which it is still found. The 

 only known member of the genus is the living white 

 rhinoceros, of which two races are recognized, one, simum, in 

 South Africa, occupying the territory from the Zambesi 

 River southward, and the other, cottoni, widely separated in 

 the upper Nile region. 



Nile White Rhinoceros 



Ceratotherium simum cottoni 



Native Names: Aluru, kenga; Sudani, khartyt; Bongo, hasha; Dy oor umzvok. 

 Rhinoceros simus coito7ii Lydekker, 1908, Field (London), vol. Ill, p. 319. 



Range. — West side of the Nile from the Aran River 

 opposite Wadelai northward through the Lado Enclave, 

 along the west bank as far as Shambe, and west across the 

 Bahr-el-Ghazal drainage to the Dar Fertit country, but not 

 known to extend beyond the Nile watershed. 



