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Africaâs white rhino species is the largest of any living rhinoceros, weighing up to 3,600 kilograms (7,920 pounds), and is the continentâs third-largest species after the African bush elephant and African forest elephant. The black rhino, which is not actually black, can weigh up to 1,400 kg (3,100 pounds). Horns of the African rhino weigh on average 1.5-3.0 kilograms (3.3-6.6 pounds), with white rhino having the heaviest front horn which on average weighs 4.0 kilograms (8.8 pounds). Horns of the Asian rhino species are substantially smaller, averaging 0.27 kilograms (0.59 pounds) to 0.72 kilograms (1.58 pounds) (page 3).
Two horns on the skull are made of keratin with the larger front horn typically 50 cm long, exceptionally up to 140 cm. Sometimes, a third smaller horn may develop. The black rhino is much smaller than the white rhino, and has a pointed mouth, which it uses to grasp leaves and twigs when feeding.he word rhinoceros is derived through Latin from the Ancient Greek: á¿¥á¿Î½ÏÎºÎµÏÏÏ, which is composed of á¿¥á¿Î½Î¿- (rhino- ,  nose ) and ÎºÎ­ÏÎ±Ï (keras,  horn ). The plural in English is rhinoceros or rhinoceroses. The collective noun for a group of rhinoceroses is crash or herd.