Source : Webster's Revised Unabridged Dictionary (1913)

Water buck \Wa"ter buck`\ (Zo["o]l.)
   A large, heavy antelope ({Kobus ellipsiprymnus}) native of
   Central Africa. It frequents the banks of rivers and is a
   good swimmer. It has a white ring around the rump. Called
   also {photomok}, {water antelope}, and {waterbok}.

   Note: The name is also applied to other related species, as
         the leche ({Kobus leche}), which has similar habits.

Source : WordNet®

Kobus leche
     n : tawny-colored African antelope inhabiting wet grassy plains;
         a threatened species [syn: {lechwe}]