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It has a pointed and prehensile upper lip, which it uses to grasp leaves and twigs when feeding.
The white rhinoceros has square lips used for eating grass.
This concept is also used by the IUCN, listing three surviving subspecies and recognizing D. Between four and five million years ago, the black rhinoceros diverged from the white rhinoceros.These horns are used for defense, intimidation, and digging up roots and breaking branches during feeding.The black rhino is smaller than the white rhino, and is close in size to the Javan Rhino of Indonesia.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.Such a skull is known to have existed and Linnaeus even mentioned India as origin of this species. The two species evolved from the common ancestral species Ceratotherium neumayri during this time.