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Common warthog

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Common warthog
Male P. a. sundevallii
Tswalu Kalahari Reserve, South Africa
Female P. a. sundevallii
Etosha National Park, Namibia
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Suidae
Genus: Phacochoerus
Species:
P. africanus
Binomial name
Phacochoerus africanus
(Gmelin, 1788)
Subspecies

4 sspp.; see text

  Distribution of the common warthog
  Possible range or accidental records

The common warthog (Phacochoerus africanus) is a wild member of the pig family (Suidae) found in grassland, savanna, and woodland in sub-Saharan Africa.[1][2] In the past, it was commonly treated as a subspecies of P. aethiopicus, but today that scientific name is restricted to the desert warthog of northern Kenya, Somalia, and eastern Ethiopia.[3]

Subspecies

Description

Skull of a male common warthog
Skeleton at the Natural History Museum in London, England

The common warthog is a medium-sized species, with a head-and-body length ranging from 0.9 to 1.5 m (2 ft 11 in to 4 ft 11 in), and shoulder height from 63.5 to 85 cm (25.0 to 33.5 in). Females, at 45 to 75 kg (99 to 165 lb), are smaller and lighter than males, at 60 to 150 kg (130 to 330 lb).[4][5] A warthog is identifiable by the two pairs of tusks protruding from the mouth and curving upwards. The lower pair, which is far shorter than the upper pair, becomes razor-sharp by rubbing against the upper pair every time the mouth is opened and closed. The upper canine teeth can grow to 25.5 cm (10.0 in) long and have a wide elliptical cross section, being about 4.5 cm (1.8 in) deep and 2.5 cm (0.98 in) wide. A tusk will curve 90° or more from the root, and will not lie flat on a table, as it curves somewhat backwards as it grows. The tusks are not used for digging,[6] but are used for combat with other hogs and in defense against predators – the lower set can inflict severe wounds.

Common warthog ivory is taken from the constantly growing canine teeth. The tusks, particularly the upper set, work in much the same way as elephant tusks with all designs scaled down. Tusks are carved predominantly for the tourist trade in eastern and southern Africa.

The head of the common warthog is large, with a mane down the spine to the middle of the back.[4] Sparse hair covers the body. Its color is usually black or brown. Tails are long and end with a tuft of hair. Common warthogs do not have subcutaneous fat and the coat is sparse, making them susceptible to extreme environmental temperatures.[4]

Ecology

A warthog grazing at Addo Elephant National Park in South Africa
Warthog fighting a leopard

The common warthog is the only pig species that has adapted to grazing and savanna habitats.[7] Its diet is omnivorous, composed of grasses, roots, berries and other fruits, bark, fungi, insects, eggs and carrion.[8] The diet is seasonably variable, depending on availability of different food items. During the wet seasons, warthogs graze[7] on short perennial grasses.[9] During the dry seasons, they subsist on bulbs, rhizomes, and nutritious roots.[7][9]

Warthogs are powerful diggers, using both their snouts and feet. When feeding, they often bend their front feet backwards and move around on the wrists.[10] Calloused pads that protect the wrists during such movement form early in the development of the fetus. Although they can dig their own burrows, they often occupy abandoned burrows of aardvarks[9] and other animals. The common warthog commonly reverses into burrows, with its head facing the opening and ready to burst out if necessary. Common warthogs will wallow in mud to cope with high temperatures and huddle together to cope with low temperatures.[11]

Although capable of fighting (males fight each other during mating season), the common warthog's primary defense is to flee by means of fast sprinting. When threatened, warthogs can run at speeds of up to 48 km/h (30 mph), they will run with their tails sticking up and will enter their dens rear first with tusks facing out.[12] The common warthog's main predators are humans, lions, leopards, cheetahs, crocodiles, wild dogs and hyenas. Birds of prey such as Verreaux's eagle owls and martial eagles sometimes prey on piglets.[13][14] However, a female common warthog will defend her piglets aggressively. On occasion, common warthogs have been observed charging and even wounding large predators. Common warthogs have also been observed allowing banded mongooses and vervet monkeys to groom them to remove ticks.[15]

Social behavior and reproduction

Common warthogs are not territorial, but instead occupy a home range.[16] Common warthogs live in groups called sounders. Females live in sounders with their young and with other females.[8] Females tend to stay in their natal groups, while males leave, but stay within the home range.[8] Subadult males associate in bachelor groups, but males live alone when they become adults.[7] Adult males only join sounders with estrous females. Warthogs have two facial glands: the tusk gland and the sebaceous gland. Common warthogs of both sexes begin to mark around six to seven months old.[17] Males tend to mark more than females.[17] They mark sleeping and feeding areas and waterholes.[17] Common warthogs use tusk marking for courtship, for antagonistic behaviors, and to establish status.[17]

Common warthogs are seasonal breeders.[7] Rutting begins in the late rainy or early dry season and birthing begins near the start of the following rainy season.[7] The mating system is described as "overlap promiscuity": the males have ranges overlapping several female ranges, and the daily behavior of the female is unpredictable. Boars employ two mating strategies during the rut. With the "staying tactic", a boar will stay and defend certain females or a resource valuable to them.[18] In the "roaming tactic", boars seek out estrous sows and compete for them.[18] Boars will wait for sows to emerge from their burrows.[7] A dominant boar will displace any other boar that also tries to court his female. When a sow leaves her den, the boar will try to demonstrate his dominance and then follow her before copulation.[7] For the "staying tactic", monogamy, female-defense polygyny, or resource-defense polygyny is promoted, while the "roaming tactic" promotes scramble-competition polygyny.[18]

The typical gestation period is five to six months. When they are about to give birth, sows temporarily leave their families to farrow in a separate hole.[7] The litter is two to eight piglets, with two to four typical. The sow will stay in the burrow for several weeks, nursing her piglets.[7] Common warthog sows have been observed to nurse foster piglets if they lose their own litter.[19] This behavior, known as allosucking, makes them cooperative breeders. Allosucking does not seem to be a case of mistaken identity or milk theft,[19] and may be a sign of kin altruism. Piglets begin grazing at about two to three weeks and are weaned by six months.[7] Piglets quickly attain mobility and stay close to their mothers for defense.[20] Common warthogs live for an average of 7 to 11 years in the wild. Captive specimens on the other hand can live for an average of 21 years. [21]

Conservation status

As of 1999, the common warthog population in southern Africa was estimated to be about 250,000.[22] Typical densities range between 1 and 10 km2 (0.39 and 3.86 sq mi) in protected areas, but local densities of 77 km2 (30 sq mi) were found on short grass in Nakuru National Park in Kenya.[23] The species is susceptible to drought and hunting (especially with dogs), which may result in localized extinctions.[1] The common warthog is present in numerous protected areas across its extensive range.[1]

As an invasive species

In 2020, it was noted that a population of warthogs, descendants of escaped individuals from game ranches, were running free in southern Texas in the United States.[24]

References

  1. ^ a b c d de Jong, Y.A.; Cumming, D.; d'Huart, J.; Butynski, T. (2017) [errata version of 2016 assessment]. "Phacochoerus africanus". IUCN Red List of Threatened Species. 2016: e.T41768A109669842. doi:10.2305/IUCN.UK.2016-2.RLTS.T41768A44140445.en. Retrieved 18 April 2022. Database entry includes a brief justification of why this species is of least concern.
  2. ^ Wilson, D. E.; Reeder, D. M., eds. (2005). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. ISBN 978-0-8018-8221-0. OCLC 62265494.
  3. ^ Wilson, D. E.; Reeder, D. M., eds. (2005). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. ISBN 978-0-8018-8221-0. OCLC 62265494.
  4. ^ a b c Creel, Eileen (11 March 2005). "Phacochoerus africanus common warthog". Animaldiversity.ummz.umich.edu. Retrieved 30 July 2013.
  5. ^ "Common Warthog Phacochoerus africanus" (PDF). Archived from the original (PDF) on 15 May 2013. Retrieved 30 July 2013.
  6. ^ Wilson, Don E.; Mittermeier, Russell A., eds. (2011). Handbook of the Mammals of the World, Vol. 2. Lynx Edicions. p. 277. ISBN 978-8496553774.
  7. ^ a b c d e f g h i j k Estes, R. (1991). The Behavior Guide to African Mammals, Including Hoofed Mammals, Carnivores, Primates. Los Angeles, University of California Press. pp. 218–221 ISBN 0520080858.
  8. ^ a b c Kleiman, D.G., Geist, V., McDade, M.C. (2004). Grzimek's Animal Life Encyclopedia. The Gale Group Inc.
  9. ^ a b c Kingdon, J. (1979). East African Mammals: An Atlas of Evolution in Africa, Volume 3, Part B: Large Mammals. Chicago, University of Chicago Press. pp. 231–249.
  10. ^ Unwin, Mike (2003). Southern African wildlife: a visitor's guide. Bradt Travel Guides. p. 68. ISBN 978-1-84162-060-2.
  11. ^ Vercammen, P., Mason, D.R. "Pigs, Peccaries and Hippos Status Survey and Action Plan Archived 9 May 2008 at the Wayback Machine".
  12. ^ "Facts About Warthogs". Live Science. 21 March 2017. Retrieved 16 March 2020.
  13. ^ "Martial Eagle Kills Baby Warthog". Orion-hotels.net. Archived from the original on 6 January 2014. Retrieved 22 August 2012.{{cite web}}: CS1 maint: unfit URL (link)
  14. ^ Owls of the World by Konig, Weick & Becking. Yale University Press (2009), ISBN 0300142277.
  15. ^ Warthog – Africa's Jester Archived 5 April 2011 at the Wayback Machine. Wildwatch.com. Retrieved 2012-08-22.
  16. ^ Maher, C. R.; Lott, D.F. (1995). "Definitions of territoriality used in the study of variation in vertebrate spacing systems". Animal Behaviour. 49 (6): 1581. doi:10.1016/0003-3472(95)90080-2. S2CID 53188426.
  17. ^ a b c d Estes, R.D.; Cumming, D.; Hearn, G.; Warthog (1982). "New Facial Gland in Domestic Pig". Journal of Mammalogy. 63 (4): 618–624. doi:10.2307/1380267. JSTOR 2462591.
  18. ^ a b c Sandell, M.; Liberg, O. (1992). "Roamers Stayers: A Model on Male Mating Tactics and Mating Systems". The American Naturalist. 139 (1): 177–189. doi:10.1086/285319. JSTOR 2462591. S2CID 85392231.
  19. ^ a b Jensen, S.P., Siefert, L., Okori, J.J.L., Clutlon-Brock, T.H. (1999). "Age Related Participation in Allosucking by Nursing Warthogs." Journal of Zoology London 248(4): 443–449
  20. ^ Walther, F. R. (1984). Communication and Expression in Hoofed Mammals. Bloomington, Indiana University Press ISBN 0253313805
  21. ^ Creel, Eileen. "Phacochoerus africanus (common warthog)". Animal Diversity Web. Retrieved 15 December 2022.
  22. ^ Cumming, D. H. M. (1999). Study on the development of Transboundary Natural Resource Management Areas in Southern Africa – Environmental Context. Natural Resources, Land Use, and Conservation. Biodiversity Support Program. Washington, DC, USA.
  23. ^ Radke, R. (1991). "Monographie des warzenschweines (Phacochoerus aethiopicus)" [Monograph on the warthog (Phacochoerus aethiopicus)]. Bongo (in German). 18. Berlin: 119–134.
  24. ^ "Warthogs on the loose in Texas — African hogs likely escapees from ranches that import exotics - Texas Hunting & Fishing | Lone Star Outdoor News". www.lsonews.com. 9 May 2015.
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