| Rhinoceros Temporal range:
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|---|---|
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| Rhinoceros species of different genera; from top-left, clockwise: white rhinoceros (Ceratotherium simum), Sumatran rhinoceros (Dicerorhinus sumatrensis), Indian rhinoceros (Rhinoceros unicornis), black rhinoceros (Diceros bicornis) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Perissodactyla |
| Superfamily: | Rhinocerotoidea |
| Family: | Rhinocerotidae Owen, 1845 |
| Type genus | |
| Rhinoceros Linnaeus, 1758
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| Extant and subfossil genera | |
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Ceratotherium | |
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| Rhinoceros range | |
A rhinoceros (/raɪˈnɒsərəs/; from Ancient Greek ῥινόκερως (rhinókerōs) 'nose-horned'; from ῥίς (rhis) 'nose' and κέρας (kéras) 'horn';[1] pl.: rhinoceros or rhinoceroses), commonly abbreviated to rhino, is a member of any of the five extant species (or numerous extinct species) of odd-toed ungulates in the family Rhinocerotidae; it can also refer to a member of any of the extinct species of the superfamily Rhinocerotoidea. Two of the extant species are native to Africa, and three to South and Southeast Asia.
Rhinoceroses are some of the largest remaining megafauna: all weigh at least one tonne in adulthood. They have a herbivorous diet, small brains 400–600 g (14–21 oz) for mammals of their size, one or two horns, and a thick 1.5–5 cm (0.59–1.97 in), protective skin formed from layers of collagen positioned in a lattice structure. They generally eat leafy material, although their ability to ferment food in their hindgut allows them to subsist on more fibrous plant matter when necessary. Unlike other perissodactyls, the two African species of rhinoceros lack teeth at the front of their mouths; they rely instead on their lips to pluck food.[2]
Rhinoceroses are killed by poachers for their horns, which are bought and sold on the black market for high prices, leading to most living rhinoceros species being considered endangered. The contemporary market for rhino horn is overwhelmingly driven by China and Vietnam, where it is bought by wealthy consumers to use in traditional Chinese medicine, among other uses. Rhino horns are made of keratin, the same material as hair and fingernails, and there is no good evidence of any health benefits.[3][4][5] A market also exists for rhino horn dagger handles in Yemen, which was the major source of demand for rhino horn in the 1970s and 1980s.[6]
- ^ "Glossary. American Museum of Natural History". Archived from the original on 20 November 2021.
- ^ Owen-Smith, Norman (1984). Macdonald, D. (ed.). The Encyclopedia of Mammals. New York: Facts on File. pp. 490–495. ISBN 978-0-87196-871-5.
- ^ "Vietnam's Appetite For Rhino Horn Drives Poaching In Africa". NPR. Retrieved 27 September 2021.
- ^ "What is a rhinoceros horn made of?". Yesmag.bc.ca. 9 October 2003. Archived from the original on 28 September 2011. Retrieved 23 September 2010.
- ^ Cheung, Hubert; Mazerolle, Lorraine; Possingham, Hugh; Biggs, Duan (1 February 2021). "Rhino horn use by consumers of traditional Chinese medicine in China". Conservation Science and Practice. 3 (5). Bibcode:2021ConSP...3E.365C. doi:10.1111/csp2.365. hdl:11573/1713877.
- ^ Vigne, Lucy; Martin, Esmond (January–March 2018). "Amid conflict, Yemen's demand for rhino horn daggers continues" (PDF). Swara. Archived (PDF) from the original on 7 March 2023 – via Rhino Resource Center.