Aspects of this topic are discussed in the following places at Britannica.
...Africa. Modern classifications are not uniform, but generally two subgenera and three species are recognized: the subgenus Beatragus, consisting of a single species, D. hunteri (Hunter’s hartebeest, or hirola), found in eastern Kenya and southwestern Somalia; and the subgenus Damaliscus, consisting of two species, D. dorcas (the bontebok [subspecies D....
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