Atelodus simus

from The Collaborative International Dictionary of English v.0.48

Mahoohoo \Ma*hoo"hoo\, n. (Zool.)
   The African white two-horned rhinoceros ({Atelodus simus}).
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

umhofo \um*ho"fo\ ([u^]m*h[=o]"f[-o]), n. (Zool.)
   An African two-horned rhinoceros ({Atelodus simus} or
   {Rhinoceros simus}); -- called also {chukuru}, and {white
   rhinoceros}.
   [1913 Webster]