Their skin harbors external parasites, such as mites and ticks, which may be eaten by oxpeckers and egrets.
Such behaviour was originally thought to be an example of mutualism, but recent evidence suggests that oxpeckers may be parasites instead, feeding on rhino blood.
This key differentiation is further illustrated by the shape of the two species mouths (lips): the "square" lip of the white rhinoceros is an adaptation for grazing, and the "hooked" lip of the black rhinoceros is an adaptation to help browsing.
The species was first named Rhinoceros bicornis by Carl Linnaeus in the 10th edition of his Systema naturae in 1758. There is some confusion about what exactly Linnaeus conceived under this name as this species was probably based upon the skull of a single-horned Indian rhinoceros (Rhinoceros unicornis), with a second horn artificially added by the collector. The most important difference to the above scheme is the inclusion of the extant southwestern subspecies from Namibia in D. bicornis instead of in its own subspecies, whereupon the nominal subspecies is not considered extinct.
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