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The term "rhinoceros" is often more broadly applied to now extinct relatives of the superfamily Rhinocerotoidea.
Members of the rhinoceros family are some of the largest remaining megafauna, with all species able to reach or exceed one tonne in weight.
East Asia, specifically Vietnam, is the largest market for rhino horns.
By weight, rhino horns cost as much as gold on the black market.
Rhinoceros are killed by some humans for their horns, which are bought and sold on the black market, and used by some cultures for ornaments or traditional medicine.
People grind up the horns and consume them, believing the dust has therapeutic properties.
Both African species and the Sumatran rhinoceros have two horns, while the Indian and Javan rhinoceros have a single horn.
The IUCN Red List identifies the Black, Javan, and Sumatran rhinoceros as critically endangered.
The family Rhinocerotidae consists of only four extant genera: Ceratotherium (White rhinoceros), Dicerorhinus (Sumatran rhinoceros), Diceros (Black rhinoceros) and Rhinoceros (Indian and Javan rhinoceros). The two African species, the white rhinoceros and the black rhinoceros, belong to the tribe Dicerotini, which originated in the middle Miocene, about 14.2 million years ago.
The white rhinoceros also has a prominent muscular hump that supports its relatively large head.