Southern white rhinoceros

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Southern white rhinoceros
Pilanesberg Rhino.JPG
A southern white rhinoceros in Pilanesberg National Park, South Africa
CITES Appendix I (CITES) [1] [note 1]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Rhinocerotidae
Genus: Ceratotherium
Species:
C. simum
Subspecies:
C. s. simum
Trinomial name
Ceratotherium simum simum
(Burchell, 1817)
Southern white rhino IUCN distribution.svg
Southern white rhino distribution range according to the IUCN.
  Extant (Resident)
  Extant and reintroduced (Resident)
  Extant and assisted colonisation (Resident)
  Presence uncertain & assisted colonisation
Synonyms
  • Ceratotherium simum burchellii(Desmarest, 1822)
  • Ceratotherium simum oswellii(Elliot, 1847)
  • Ceratotherium simum kiaboaba(Murray, 1866)

The southern white rhinoceros or southern white rhino (Ceratotherium simum simum) is one of the two subspecies of the white rhinoceros (the other being the much rarer northern white rhinoceros). It is the most common and widespread subspecies of rhinoceros.

Contents

Taxonomic and evolutionary history

The southern white rhinoceros is the nominate subspecies; it was given the scientific name Ceratotherium simum simum by the English explorer William John Burchell 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. 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 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. [2]

Physical descriptions

A southern white rhino mother with calf in Namibia. White rhino 2008 08.jpg
A southern white rhino mother with calf in Namibia.

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 1,600–1,700 kg (3,530–3,750 lb) and males around 2,000–2,300 kg (4,410–5,070 lb), with specimens of up to 3,600 kilograms (7,940 lb) considered reliable, and larger sizes up to 4,500 kg (9,920 lb) claimed but not verified. [3] [4] [5] [6] [7] [8] The head-and-body length is 3.35–4 m (11.0–13.1 ft) and a shoulder height of 160–186 cm (5.25–6.10 ft). [4] [7] It has two horns on its snout. The front horn is larger than the other horn and averages 60 cm (24 in) in length and can reach 166 cm (65 in) in females. [9] [7] 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. Southern white rhinos are strictly herbivores (graminivores) that feed on short grasses.

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 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. [10] Newborn calves weigh about 45 kg (100 pounds) at birth. Young usually become independent in 2–3 years.

Habitat and distribution

A southern white rhino pair at Mosi-oa-Tunya National Park, Zambia. Rhino Pair at Mosi-Oa-Tuniya.jpg
A southern white rhino pair at Mosi-oa-Tunya National Park, Zambia.

The southern white rhino lives in the grasslands, savannahs, and shrublands of southern Africa, ranging from South Africa to Zambia. About 98.5% of southern white rhino live in just five countries: South Africa, Namibia, Zimbabwe, Kenya and Uganda.

Population and threats

Taxidermied specimen, Royal Ontario Museum White Rino from Toronto.jpg
Taxidermied specimen, Royal Ontario Museum

The southern white rhino is listed as Near Threatened; it is mostly threatened by habitat loss and poaching for rhino horn for use in traditional Chinese medicine. [1]

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 due to sport hunting and land clearance. [11] 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. [12] 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. 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 since 2002. [12]

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. [13]

Conservation status

The subspecies is protected under the Convention on International Trade in Endangered Species (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. [14]

Introduction/reintroduction projects

A southern white rhinoceros crash in Lake Nakuru, Kenya. Lake Nakuru Kenya, Feb 2007.jpg
A southern white rhinoceros crash in Lake Nakuru, Kenya.
A captive southern white rhinoceros in Bioparc Valencia, Valencia, Spain. Rhinoceros full body.jpg
A captive southern white rhinoceros in Bioparc Valencia, Valencia, Spain.

There are small, reintroduced populations within the historical range of the southern white rhinoceros in Botswana, Eswatini, Namibia, Zambia, Zimbabwe and in the southwest of the Democratic Republic of the Congo, while a small population survives in Mozambique. Populations have also been introduced outside of the former range of the species to Kenya, Uganda and Zambia, where their northern relatives used to occur. [15] The southern white rhinoceros has been reintroduced into the Ziwa Rhino Sanctuary in Uganda, [16] 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, shipped to the Yunnan Province in southwestern China, where they were kept in an animal-wildlife park for quarantine and acclimitisation. In March 2013, seven of the animals were shipped to the Laiyanghe National Forest Park, a habitat where Sumatran and Javan rhinoceros once roamed. [17] The remaining two southern white rhinos began the process of being released into the wild on May 13, 2014. [18]

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. [19] In Escondido, California, 96 calves have been born at the San Diego Zoo Safari Park since its opening in 1972. The nearly 2,000-acre Park, which is the sister-facility of the San Diego Zoo (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. [20] 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, [21] and has seen more than 1,800 natural births [22] since 1993. [23] In South Africa, a population of southern white rhinos are being raised on farms and ranches for their horns, along with black rhinos, in an effort to mitigate poaching. [24]

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<span class="mw-page-title-main">Javan rhinoceros</span> Rare species of rhinoceros from Asia

The Javan rhinoceros, Javan rhino, Sunda rhinoceros or lesser one-horned rhinoceros is a critically endangered member of the genus Rhinoceros, of the rhinoceros family, Rhinocerotidae, and one of the five remaining extant rhinoceros species across South Asia and Africa. The Javan rhinoceros is one of the smallest rhinoceros species, along with the Sumatran, or "hairy", rhinoceros. They are superficially similar to Indian one-horned rhinos, as they have plate-like, "armored" protective skin folds, but are slightly smaller in size, at just 3.1–3.2 m (10–10 ft) long and 1.4–1.7 m (4.6–5.6 ft) tall, on average. The heaviest specimens weigh around 2,300 kg/2.3 tonnes, similar to an African black rhinoceros. However, unlike the long and potentially lethal horns of the black or white rhinoceroses of Africa, the Javan species' single, somewhat blunted horn is usually shorter than 25 cm (9.8 in).

<span class="mw-page-title-main">Black rhinoceros</span> Species of mammal

The black rhinoceros, black rhino or hook-lipped rhinoceros is a species of rhinoceros, native to eastern and southern Africa including Angola, Botswana, Kenya, Malawi, Mozambique, Namibia, South Africa, Eswatini, Tanzania, Zambia, and Zimbabwe. Although the species is referred to as black, its colours vary from brown to grey. It is the only extant species of the genus Diceros.

<span class="mw-page-title-main">Sumatran rhinoceros</span> Critically Endangered species of small Asian rhinoceros

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<span class="mw-page-title-main">Rhinoceros</span> Family of mammals

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References

  1. 1 2 3 Emslie, R. (2020). "Ceratotherium simum ssp. simum". IUCN Red List of Threatened Species . 2020: e.T39317A45814320. doi: 10.2305/IUCN.UK.2020-1.RLTS.T39317A45814320.en . Retrieved 12 November 2021.
  2. ↑ Groves, C.P.; Fernando, P; Robovský, J (2010). "The Sixth Rhino: A Taxonomic Re-Assessment of the Critically Endangered Northern White Rhinoceros". PLOS ONE. 5 (4): e9703. Bibcode:2010PLoSO...5.9703G. doi: 10.1371/journal.pone.0009703 . PMC   2850923 . PMID   20383328.
  3. ↑ Owen-Smith, R. Norman (1992). Megaherbivores: The Influence of Very Large Body Size on Ecology. Cambridge University Press. ISBN   9780521426374.
  4. 1 2 Macdonald, D. (2001). The New Encyclopedia of Mammals. Oxford University Press, Oxford. ISBN   0198508239.
  5. ↑ Allen, Jeremiah (2010). Namibia (Other Places Travel Guide). Other Places Publishing. p. 63. ISBN   978-0-9822619-6-5.
  6. ↑ Newton, Michael (2009). Hidden Animals: A Field Guide to Batsquatch, Chupacabra, and Other Elusive Creatures. Greenwood Press. p. 185. ISBN   978-0-313-35906-4.
  7. 1 2 3 Groves, C. P. (1972). "Ceratotherium simum". Mammalian Species (8): 1–6. doi: 10.2307/3503966 . JSTOR   3503966.
  8. ↑ Wroe, S.; Crowther, M.; Dortch, J. & Chong, J. (2004). "The size of the largest marsupial and why it matters". Proceedings of the Royal Society B: Biological Sciences. 271 (Supplement 3): S34–6. doi:10.1098/rsbl.2003.0095. JSTOR   4142550. PMC   1810005 . PMID   15101412.
  9. ↑ Heller, E. (1913). "The white rhinoceros". Smithsonian Misc. Coll. 61 (1).
  10. ↑ https://africafreak.com/baby-rhino#:~:text=Adult%20males%20sometimes%20attack%20or,safe%20from%20their%20own%20kin.
  11. ↑ Emslie, R.H.; Amin, R.; Koch, R. "Guidelines for the in situ re-introduction and translocation of African and Asian rhinoceros" (PDF). Retrieved 18 March 2023.
  12. 1 2 Emslie, R. (2020). "Ceratotherium simum. The IUCN Red List of Threatened Species 2020". www.iucnredlist.org. doi: 10.2305/IUCN.UK.2020-1.RLTS.T4185A45813880.en . Retrieved 18 March 2023.
  13. ↑ Michael 't Sas-Rolfes. "Saving African Rhinos: A Market Success Story" (PDF). Archived from the original (PDF) on 14 January 2016. Retrieved 27 September 2015.{{cite journal}}: Cite journal requires |journal= (help)
  14. ↑ "Appendices". Convention on International Trade in Endangered Species. CITES. Retrieved 18 March 2023.
  15. ↑ Emslie, R. & Brooks, M. (1999). African Rhino. Status Survey and Conservation Action Plan. IUCN/SSC African Rhino Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK. ISBN   2-8317-0502-9.
  16. ↑ Lutalo, Eric (14 May 2017). "Ziwa sanctuary where rhinos have a lease of life". www.rhinofund.org. Archived from the original on 2021-05-06. Retrieved 2019-05-15.
  17. ↑ Patrick Scally, "Rhinos reintroduced to Yunnan" GoKunming.com Archived 2017-10-08 at the Wayback Machine 2013-04-02
  18. ↑ (Chinese) 13、中央电视台新闻频道-[新闻直播间]云南普洱：白犀牛今天进行 2014-05-13
  19. ↑ Association of Zoos and Aquariums (2017). "Species Survival Plans".
  20. ↑ San Diego Zoo Global Public Relations (2017). "Rhino Born Thanks to Science".
  21. ↑ Radio Interview (2021). "White Rhino CBO on The Joyride".
  22. ↑ Getaway Magazine (2021). "North West breeder aims to rewild 100 rhinos annually".
  23. ↑ "Our Story". rhinos.mobi. 2022. Retrieved 28 August 2022.
  24. ↑ "Can farming rhinos for their horns save the species?". The Daily Telegraph . November 11, 2017. Retrieved 26 July 2018.

Notes

  1. ↑ Ceratotherium simum POOSAY populations of South Africa and Eswatini are included in Appendix II for the exclusive purpose of allowing international trade in live animals to appropriate and acceptable destinations and hunting trophies. The population of Namibia is included in Appendix II for the exclusive purpose of allowing international trade in live animals for in-situ conservation only and only within the natural and historical range of Ceratotherium simum in Africa.
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