Definition of "koodoo"

For instance, the very vase from which we were then drinking had on one side a most spirited drawing of men, apparently white in colour, attacking a bull-elephant with spears, while on the reverse was a picture, not quite so well done, of a hunter shooting an arrow at a running antelope, I should say from the look of it either an eland or a koodoo.

1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887

"The koodoo lying partly on its side, with both hind-legs hampered by the mass of dead wood, could not rise, but it swept the clear space in front with the terrible horns, and for some time kept Jock at bay."

1976 Sir Percy Fitzpatrick, Jock of the Bushveld p. 190. Longman: (The book was first published in 1907).