Southern White Rhino
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The southern white rhinoceros or southern white rhino (''Ceratotherium simum simum'') is one of the two
subspecies In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...
of the
white rhinoceros The white rhinoceros, also known as the white rhino or square-lipped rhinoceros (''Ceratotherium simum''), is the largest extant species of rhinoceros and the most Sociality, social of all rhino species, characterized by its wide mouth adapted f ...
(the other being the much rarer
northern white rhinoceros The northern white rhinoceros or northern white rhino (''Ceratotherium simum cottoni'') is one of two subspecies of the white rhinoceros (the other being the southern white rhinoceros). This subspecies is a grazer in grasslands and savanna wood ...
). It is the most common and widespread subspecies of
rhinoceros A rhinoceros ( ; ; ; : rhinoceros or rhinoceroses), commonly abbreviated to rhino, is a member of any of the five extant taxon, extant species (or numerous extinct species) of odd-toed ungulates (perissodactyls) in the family (biology), famil ...
.


Taxonomic and evolutionary history

The southern white rhinoceros is the
nominate subspecies In biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics ( morphology), but that can successfully interbreed. ...
; it was given the scientific name ''Ceratotherium simum simum'' by the English
explorer Exploration is the process of exploring, an activity which has some Expectation (epistemic), expectation of Discovery (observation), discovery. Organised exploration is largely a human activity, but exploratory activity is common to most organis ...
William John Burchell __NOTOC__ William John Burchell (23 July 1781 – 23 March 1863) was an English explorer, naturalist, traveller, artist, and author. His thousands of plant specimens, as well as field journals from his South African expedition, are held by Kew ...
in the 1810s. The subspecies is also known as Burchell's rhinoceros (''Ceratotherium simum burchellii'') after Burchell and Oswell's rhinoceros (''Ceratotherium simum oswellii'') after William Cotton Oswell, respectively. However, these are considered synonyms of its original scientific name. ''Ceratotherium simum kiaboaba'' (or ''Rhinoceros kiaboaba''), also known as straight-horned rhinoceros, was proposed as a different subspecies (or species) found near Lake Ngami and north of the
Kalahari Desert The Kalahari Desert is a large semiarid climate, semiarid sandy savanna in Southern Africa covering including much of Botswana as well as parts of Namibia and South Africa. It is not to be confused with the Angolan, Namibian, and South African ...
. However, it is now considered part of the southern white rhinoceros and ranges throughout southern Africa. Following the phylogenetic species concept, research in 2010 suggested the southern and
northern white rhinoceros The northern white rhinoceros or northern white rhino (''Ceratotherium simum cottoni'') is one of two subspecies of the white rhinoceros (the other being the southern white rhinoceros). This subspecies is a grazer in grasslands and savanna wood ...
may be different species, rather than subspecies, in which case the correct scientific name for the northern subspecies is ''Ceratotherium cottoni'' and the southern subspecies should be known as simply ''Ceratotherium simum''. Distinct morphological and genetic differences suggest the two proposed species have been separated for at least a million years.


Physical descriptions

The southern white rhinoceros is one of largest and heaviest land animals in the world. It has an immense body and large head, a short neck and broad chest. Females weigh around and males around , with specimens of up to considered reliable, and larger sizes up to claimed but not verified. The head-and-body length is and a shoulder height of . It has two horns on its snout. The front horn is larger than the other horn and averages in length and can reach in females. Females usually have longer but thinner horns than the males, who have larger but shorter ones. The southern white rhinoceros also has a prominent muscular hump that supports its large head. The colour of this animal can range from yellowish brown to slate grey. Most of its body hair is found on the ear fringes and tail bristles, with the rest distributed sparsely over the rest of the body. The southern white rhino has a distinctive flat, broad mouth that is used for
grazing In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to free range (roam around) and consume wild vegetations in order to feed conversion ratio, convert the otherwise indigestible (by human diges ...
. Southern white rhinos are strictly herbivores (graminivores) that feed on short grasses. Lifespan is up to 50 years in the wild.


Mating and reproduction

Little is known about southern white rhinoceros mating habits, but females reproduce every 2–3 years. They give birth to a single calf, after a
gestation Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). It is typical for mammals, but also occurs for some non-mammals. Mammals during pregn ...
period that lasts around 16 months. Males are never directly involved in the raising of calves; in rare instances, certain rogue individuals may even kill calves that they perceive as future competition, both for resources and bloodline dominance. Newborn calves weigh about 45 kg (100 pounds) at birth. Young usually become independent in 2–3 years.


Habitat and distribution

The southern white rhino lives in the
grassland A grassland is an area where the vegetation is dominance (ecology), dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes such as clover, and other Herbaceo ...
s,
savanna A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach th ...
hs, and
shrubland Shrubland, scrubland, scrub, brush, or bush is a plant community characterized by vegetation dominance (ecology), dominated by shrubs, often also including grasses, herbaceous plant, herbs, and geophytes. Shrubland may either occur naturally o ...
s of southern Africa, ranging from South Africa to
Zambia Zambia, officially the Republic of Zambia, is a landlocked country at the crossroads of Central Africa, Central, Southern Africa, Southern and East Africa. It is typically referred to being in South-Central Africa or Southern Africa. It is bor ...
. About 98.5% of southern white rhino live in just five countries: South Africa,
Namibia Namibia, officially the Republic of Namibia, is a country on the west coast of Southern Africa. Its borders include the Atlantic Ocean to the west, Angola and Zambia to the north, Botswana to the east and South Africa to the south; in the no ...
,
Zimbabwe file:Zimbabwe, relief map.jpg, upright=1.22, Zimbabwe, relief map Zimbabwe, officially the Republic of Zimbabwe, is a landlocked country in Southeast Africa, between the Zambezi and Limpopo Rivers, bordered by South Africa to the south, Bots ...
,
Kenya Kenya, officially the Republic of Kenya, is a country located in East Africa. With an estimated population of more than 52.4 million as of mid-2024, Kenya is the 27th-most-populous country in the world and the 7th most populous in Africa. ...
and
Uganda Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the ...
.


Population and threats

The southern white rhino is listed as
Near Threatened A near-threatened species is a species which has been Conservation status, categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature (IUCN) as that may be vulnerable to Endangered species, endangerment in the ne ...
; it is mostly threatened by habitat loss and
poaching Poaching is the illegal hunting or capturing of wild animals, usually associated with land use rights. Poaching was once performed by impoverished peasants for subsistence purposes and to supplement meager diets. It was set against the huntin ...
for rhino horn for use in
traditional Chinese medicine Traditional Chinese medicine (TCM) is an alternative medicine, alternative medical practice drawn from traditional medicine in China. A large share of its claims are pseudoscientific, with the majority of treatments having no robust evidence ...
. The southern white rhino was nearly extinct near the end of the 19th century having been reduced to a population of approximately 20–50 animals in
KwaZulu-Natal KwaZulu-Natal (, also referred to as KZN) is a Provinces of South Africa, province of South Africa that was created in 1994 when the government merged the Zulu people, Zulu bantustan of KwaZulu ("Place of the Zulu" in Zulu language, Zulu) and ...
due to sport hunting and land clearance. Numbers increased rapidly from 1992 to 2010, due to intensive protection and translocation efforts, however population growth then slowed as poaching increased, with numbers declining from 2012 to 2017. An approximate 15% decline in estimated numbers between 2012 and 2017 was primarily due to reductions in populations within South Africa's
Kruger National Park Kruger National Park () is a national park in South Africa covering an area of in the provinces of Limpopo and Mpumalanga in the country's northeast. It extends from north to south and from east to west. The administrative headquarters are i ...
. Poaching rates peaked in 2014 and as of December 2017, there were an estimated 18,064 southern white rhino in the wild with populations being assessed as
Near Threatened A near-threatened species is a species which has been Conservation status, categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature (IUCN) as that may be vulnerable to Endangered species, endangerment in the ne ...
since 2002. White rhino trophy hunting was legalized and regulated in 1968, and after initial miscalculations is now generally seen to have assisted in the species' recovery by providing incentives for landowners to boost rhino populations.


Conservation status

The subspecies is protected under the
Convention on International Trade in Endangered Species Convention may refer to: * Convention (norm), a custom or tradition, a standard of presentation or conduct ** Treaty, an agreement in international law ** Convention (political norm), uncodified legal or political tradition * Convention (meeting ...
(CITES) meaning international import/export (including in parts/derivatives) is regulated by the CITES permit system. Populations of South Africa, Eswatini and Namibia are listed in CITES Appendix II with strict conditions while all other populations are listed in CITES Appendix I.


Introduction/reintroduction projects

There are small, reintroduced populations within the historical range of the southern white rhinoceros in
Botswana Botswana, officially the Republic of Botswana, is a landlocked country in Southern Africa. Botswana is topographically flat, with approximately 70 percent of its territory part of the Kalahari Desert. It is bordered by South Africa to the sou ...
,
Eswatini Eswatini, formally the Kingdom of Eswatini, also known by its former official names Swaziland and the Kingdom of Swaziland, is a landlocked country in Southern Africa. It is bordered by South Africa on all sides except the northeast, where i ...
,
Namibia Namibia, officially the Republic of Namibia, is a country on the west coast of Southern Africa. Its borders include the Atlantic Ocean to the west, Angola and Zambia to the north, Botswana to the east and South Africa to the south; in the no ...
,
Zambia Zambia, officially the Republic of Zambia, is a landlocked country at the crossroads of Central Africa, Central, Southern Africa, Southern and East Africa. It is typically referred to being in South-Central Africa or Southern Africa. It is bor ...
,
Zimbabwe file:Zimbabwe, relief map.jpg, upright=1.22, Zimbabwe, relief map Zimbabwe, officially the Republic of Zimbabwe, is a landlocked country in Southeast Africa, between the Zambezi and Limpopo Rivers, bordered by South Africa to the south, Bots ...
and in the southwest of the
Democratic Republic of the Congo The Democratic Republic of the Congo (DRC), also known as the DR Congo, Congo-Kinshasa, or simply the Congo (the last ambiguously also referring to the neighbouring Republic of the Congo), is a country in Central Africa. By land area, it is t ...
, while a small population survives in
Mozambique Mozambique, officially the Republic of Mozambique, is a country located in Southeast Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west, and Eswatini and South Afr ...
. Populations have also been introduced outside of the former range of the species to
Kenya Kenya, officially the Republic of Kenya, is a country located in East Africa. With an estimated population of more than 52.4 million as of mid-2024, Kenya is the 27th-most-populous country in the world and the 7th most populous in Africa. ...
,
Uganda Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, and to the ...
and
Zambia Zambia, officially the Republic of Zambia, is a landlocked country at the crossroads of Central Africa, Central, Southern Africa, Southern and East Africa. It is typically referred to being in South-Central Africa or Southern Africa. It is bor ...
, where their northern relatives used to occur. The southern white rhinoceros has been reintroduced into the Ziwa Rhino Sanctuary in Uganda, and in the Lake Nakuru National Park and the Kigio Wildlife Conservancy in Kenya. In 2010, nine southern white rhinoceroses were imported from
South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
, shipped to the
Yunnan Province Yunnan; is an inland Provinces of China, province in Southwestern China. The province spans approximately and has a population of 47.2 million (as of 2020). The capital of the province is Kunming. The province borders the Chinese provinces ...
in
southwestern China Southwestern China () is a region in the People's Republic of China. It consists of five provincial administrative regions, namely Chongqing, Sichuan, Guizhou, Yunnan, and Xizang. Geography Southwestern China is a rugged and mountainous region, ...
, where they were kept in an animal-wildlife park for quarantine and acclimatisation. In March 2013, seven of the animals were shipped to the Laiyanghe National Forest Park, a habitat where
Sumatran Sumatra () is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 482,286.55 km2 (182,812 mi.2), including adjacent i ...
and Javan rhinoceros once roamed. The remaining two southern white rhinos began the process of being released into the wild on May 13, 2014. In 2023, African Parks, supported by foundations such as those of Howard Buffett and the
Walton Family The Walton family is an American family whose collective fortune derived from Walmart makes them the richest family in the United States, and, as of December 2024, the List of wealthiest families, richest family in the world. Overview The thr ...
, has launched a major conservation initiative by purchasing the largest privately-owned herd of southern white rhinos, consisting of 2,000 animals from a distressed operation in central South Africa. The nonprofit, managing 22 conservation areas over 20 million hectares across 12 African countries, has begun reintroducing these rhinos to their natural habitats, starting with a donation of 40 rhinos to the Munywana Conservancy in the southeast of
South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
. This effort aims to relocate 15% of the global southern white rhino population to protected areas within their historical ranges, in response to the severe threats posed by over a century of hunting and poaching, which has drastically reduced their numbers to about 13,000, mostly in South Africa.


In captivity

Wild-caught southern white rhinoceros will readily breed in captivity when given appropriate living space, veterinary care, food, and water, as well as the presence of multiple female rhinos of breeding age; many white rhinoceroses seen in zoos today are the direct descendants of a cooperative breeding program initiated in the 1970s to increase the population, and maintain genetic diversity, without capturing individuals from the wild. In
Escondido, California Escondido (Spanish language, Spanish for "Hidden") is a city in San Diego County, California, United States. Located in the North County (San Diego area), North County region, it was incorporated in 1888, and is one of the oldest cities in San ...
, 96 calves have been born at the
San Diego Zoo Safari Park The San Diego Zoo Safari Park is a zoo and safari park in Escondido, California, Escondido, a suburb of the city of San Diego, California, located in San Pasqual Valley, San Diego, San Pasqual Valley. Opened in 1972, the park operates as a sis ...
since its opening in 1972. The nearly 2,000-acre Park, which is the sister-facility of the
San Diego Zoo The San Diego Zoo is a zoo in San Diego, California, United States, located in Balboa Park (San Diego), Balboa Park. It began with a collection of animals left over from the 1915 Panama–California Exposition that were brought together by its ...
(located 30 miles south in the City of San Diego) has been an international leader in southern white rhinoceros husbandry and breeding. However, reproductive rates are fairly low among captive-born female southern white rhinoceroses, potentially due to eating a different diet than would be consumed in the wild. Ongoing research, through San Diego Zoo Global, is hoping to not only focus on this, but also on identifying other captive species that are possibly affected and developing new diets and feeding practices aimed at enhancing fertility. When managed correctly, the rate of natural reproduction among captive-born southern white females is relatively successful, as can be seen by the success of John Frederik Hume's rhino-breeding initiative, which currently has an average of 200 natural births per year, and has seen more than 1,800 natural births since 1993. In
South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
, a population of southern white rhinos are being raised on
farm A farm (also called an agricultural holding) is an area of land that is devoted primarily to agricultural processes with the primary objective of producing food and other crops; it is the basic facility in food production. The name is used fo ...
s and
ranch A ranch (from /Mexican Spanish) is an area of landscape, land, including various structures, given primarily to ranching, the practice of raising grazing livestock such as cattle and sheep. It is a subtype of farm. These terms are most often ap ...
es for their horns, along with black rhinos, in an effort to mitigate poaching.


References


Notes

{{Taxonbar, from=Q5762455 Dicerotini Mammals described in 1817 Mammals of South Africa Mammals of Zimbabwe Mammals of Botswana Mammals of Namibia Mammals of Zambia