Babirusa

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Babirusa
Hirscheber1a.jpg
A male Babyrousa celebensis; note that only adult males possess the distinctive tusks
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Superorder: Cetartiodactyla
Order: Artiodactyla
Family: Suidae
Subfamily: Babyrousinae
Genus: Babyrousa
Perry, 1811
Species

3-4, See text.

The babirusas, also pig-deer, (from Indonesian bābī rūsa, lit. "deer-hog"[1]) are a genus, Babyrousa, in the pig family (Suidae) found in Wallacea, or specifically the Indonesian islands of Sulawesi, Togian, Sula and Buru.[2] All members of this genus were considered part of a single species until 2002, the babirusa, B. babyrussa, but following the split into several species, this scientific name is restricted to the Buru babirusa from Buru and Sula, whereas the best-known species, the north Sulawesi babirusa, is named B. celebensis.[3] If a babirusa does not grind its tusks (achievable through regular activity), they can eventually keep growing so as to penetrate the animal's own skull.[4]

Classification[edit]

The genus is monotypic within the subfamily Babyrousinae, or alternatively considered to form a tribe, Babyrousini, of the subfamily Suinae. To date, only one fossil skull has been found to suggest a larger ancestor.[5]

All members of the genus were considered part of a single species until recently, the babirusa or pig-deer, B. babyrussa, but following the split into several species, this scientific name is restricted to the Buru babirusa from Buru and the Sula Islands, whereas the best-known species, the north Sulawesi babirusa, is named B. celebensis.[3] The split, which uses the phylogenetic species concept, is based on differences in size, amount of hair on body and tail-tuft, and measurements of the skull and teeth.[3]

Species[edit]

B. babyrussa beruensis was described as an extinct, Pleistocene subspecies from southwestern Sulawesi before babirusas were split into multiple species.

Physical description[edit]

Skull of a male North Sulawesi babirusa (37 cm long)

Babirusa are notable for the long upper canines in the males. The upper canines of male babirusa emerge vertically from the alveolar process, penetrating though the skin and curving backward over the front of the face and towards the forehead.[6] The lower canines also grow upwards. The canines of the female are either reduced or absent.[6] The structure of the male’s canines vary by species. In the golden babirusa, the upper canines are short and slender with the alveolar rotated forward to allow the lower canines to cross the lateral view.[6] The Togian babirusa also has the same characteristics and the upper canines always converge. The North Sulawesi babirusa has long and thick upper canines with a vertically implanted alveolar. This caused the upper canines to emerge vertically and not cross with the lower canines.[7] Babirusa also vary by species in other characteristics. The golden babirusa has a long, thick pelage that is white, creamy gold, black or gold overall and black at the rump.[6] The pelage of the Togian babirusa is also long but not as that of the golden babirusa. The Togian babirusa has a tawny, brown or black pelage that is darker on the upper parts than in the lower parts.[6] The North Sulawesi babirusa has very short hair and appears bald. The female babirusa has only one pair of teats.[8]

Biology and ecology[edit]

Babirusa are native to Sulawesi, some of the Togian Islands, the Sula Islands and Buru.[6] In Sulawesi, they range from the northern peninsula to the south and south east provinces. Although babirusas are present on both Sulawesi and Sula, they are not found on the large islands between the two, the Banggai Archipelago. It has been hypothesized the unusual distribution is due to their being transported by humans as gifts bestowed by native royalty.[9] The preferred habitat of babirusa are tropical rainforests along river banks.[6] It appears that they have been confined to the higher grounds in the interior despite occurring in lowland areas near coasts in the past.[6] They are also active during the daytime. Like all pig species, babirusa have an omnivorous diet with an intestinal tract similar to that of the domestic pig.[10] The stomach divertculum of a babirusa is enlarged which may indicate that it is a ruminant but evidence shows otherwise.[6] Because it does not have a rostral bone in the nose, a babirusa does not dig with its snout like other pigs do except in mud and swampy grounds. The diet of the babirusa includes leaves, roots, fruits and animal material. Apparently, the strong jaws of a babirusa are capable of easily cracking hard nuts.[6]

Male babirusa tend to live solitarily while adult females can be found in groups with young.[11] Groups of female and young babirusa may number up to 84 individuals, most of which contain no adult males. Males rarely travel in pairs or trios.[11] The tusks of the adult males are used in intraspecific fighting. The upper tusks are for defense while the lower tusks are offensive weapons.[12] Female babirusa cycle lengths between 28 and 42 days and estrus last 2–3 days.[6] The litter size for a babirusa is usually one or two piglets.[6]

Relationship to humans[edit]

In Indonesia, the striking appearance of the babirusa has inspired demonic masks, and the animal itself is sometimes used as a gift to present to visitors.[13]

The Balinese Hindu-era Court of Justice pavilion and the "floating pavilion" of Klungkung palace ruins are notable for painted babirusa raksasa (grotesques) on the ceilings.[9]

Conservation status[edit]

Babirusas are protected in Indonesia and poaching is illegal. However, hunting remains a significant threat to the babirusa. Additionally, commercial logging operations threaten the babirusa by habitat loss, and also reduce cover, making the babirusa more exposed to hunters.[13] All extant species of babirusa are listed as vulnerable or endangered by the IUCN.[14]

References[edit]

  1. ^ Skeat, Walter W. (1901). A Concise Etymological Dictionary of the English Language. p. 35. Retrieved 17 July 2012. 
  2. ^ Wilson, D. E.; Reeder, D. M., eds. (2005). Mammal Species of the World (3rd ed.). Johns Hopkins University Press. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  3. ^ a b c Meijaard, E., & C. Groves. (2002). Proposal for taxonomic changes within the genus Babyrousa. Asian Wild Pig News 2 (1), 9-10.
  4. ^ http://scienceblogs.com/tetrapodzoology/2010/03/08/babirusa-impales-own-head/
  5. ^ Ian Metcalfe, Faunal and floral migrations and evolution in SE Asia-AustralasiaCRC Press, 2001. ISBN 978-90-5809-349-3. 416 pages: pp338.
  6. ^ a b c d e f g h i j k l MacDonald, A. A. 1993. The Babirusa (Babyrousa babyrussa). In: W. L. R. Oliver (ed.), Pigs, Peccaries, and Hippos: Status Survey and Conservation Action Plan, IUCN, Gland, Switzerland.
  7. ^ Groves, C. 1980. Notes on the systematics of Babyrousa (Artiodactyla, Suidae). Zoologische Mededelingen 55:29–46.
  8. ^ BBC (2010). Babirusa. Downloaded 18 April 2010.
  9. ^ a b Umberto Albarella, Keith Dobney, Anton Ervynck: 2007. Pigs and humans: 10,000 years of interaction Oxford University Press 2007. ISBN 978-0-19-920704-6. 454 pages: pp20.
  10. ^ Langer, P. (1988): The Mammalian Herbivore Stomach - Comparative Anatomy, Function and Evolution. Gustav Fischer, Stuttgart and New York: 136-161.
  11. ^ a b Patry, Maurice; Leus, Kristin; Macdonald, Alastair A (1995) "Group Structure and Behaviour of Babirusa (Babyrousa babyrussa) in Northern Sulawesi", Australian Journal of Zoology, 43:643-655.
  12. ^ J. MacKinnon, (1981) "The structure and function of the tusks of babirusa", Mammal Review, 11(1):37-40.
  13. ^ a b "Sulawesi babirusa (Babyrousa celebensis)". ARKive. Retrieved 17 July 2012. 
  14. ^ IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. Downloaded 18 April 2010.