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, basha; Dyoor umwoh. 
Rhinoceros simus cottoni Lydekker, 1908, Field (London), vol. Ill, p. 319. 
Range. —West side of the Nile from the Arau 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. 
