 Reference Base  The mammals of South Africa, vol I: Primates, carnivora a... |
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Sclater, W.L., 1900. The mammals of South Africa, vol I: Primates, carnivora and ungulata. London, R.H. Porter, pp. i-xxxi, 1-324
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World |
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Taxonomy |
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Black Rhino |
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A variety which appears to be only an accidental one, in which the posterior horn is equal to, or exceeds the anterior one, was long considered a distinct species under the name of R. keitloa; that every gradation between the relative size of the two horns is found in nature, and that the distinction is not of specific value, was first proved by Selous in his paper above quoted.
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