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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).
Black rhinos boast two horns, the foremost more prominent than the other. Rhino horns grow as much as three inches (eight centimeters) a year, and have been known to grow up to five feet (one and a half meters) long.Females use their horns to protect their young, while males use them to battle attackers. The prominent horn for which rhinos are so well known has also been their downfall.lack rhinos boast two horns, the foremost more prominent than the other. Rhino horns grow as much as three inches (eight centimeters) a year, and have been known to grow up to five feet (one and a half meters) long. Females use their horns to protect their young, while males use them to battle attackers.