Steenbok

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Steenbok
Raphicerus campestris male (Etosha, 2012).jpg
Raphicerus campestris female (Etosha, 2012).jpg
Male and female in Etosha N. P.
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Bovidae
Subfamily: Antilopinae
Genus: Raphicerus
Species:
R. campestris
Binomial name
Raphicerus campestris
Thunberg, 1811
Steenbok distribution.svg
  Distribution based on 1970s data. [2]

The steenbok /ˈstnbɒk,ˈstn-/ [lower-alpha 1] (Raphicerus campestris) is a common small antelope of southern and eastern Africa. It is sometimes known as the steinbuck or steinbok.

Contents

Description

Steenbok phylogenetic relationships (simplified) Steenbok evolution tree.svg
Steenbok phylogenetic relationships (simplified)

Steenbok resemble small oribi, standing 45–60 cm (16"–24") at the shoulder, and average ~12 kg. Their coat is any shade from fawn to rufous, typically rather orange. The underside, including chin and throat, is white, as is the ring around the eye. Ears are large with "finger-marks" on the inside. Males have straight, smooth, parallel horns 7–19 cm long (see image left). There is a black crescent-shape between the ears, a long black bridge to the glossy black nose, and a black circular scent-gland in front of the eye. The tail is not usually visible, being only 4–6 cm long.

Distribution

There are two distinct clusters in steenbok distribution. In East Africa, it occurs in central and southern Kenya and northern Tanzania. It was formerly widespread in Uganda, [2] but is now almost certainly extinct there. In Southern Africa, it occurs in Angola, Namibia, South Africa, Eswatini, Botswana, Mozambique, Zambia, Zimbabwe and probably Lesotho.

Habitat

Steenbok live in a variety of habitats from semi-desert, such as the edge of the Kalahari Desert and Etosha National Park, to open woodland and thickets, including open plains, stony savannah, and Acacia grassland mosaics. They are said to favour unstable or transitional habitats. [5] At least in the central part of Kruger National Park, South Africa, Steenbok show a distinct preference for Acacia tortilis savannah throughout the year, with no tendency to migrate to moister areas during the dry season (unlike many larger African savannah ungulates, including species sympatric with Steenbok in the wet season). [6]

Population density is typically 0.3–1.0 individuals per square kilometre, reaching 4 per km2 in optimal habitats. [7]

Diet

Steenbok typically browse on low-level vegetation (they cannot reach above 0.9 m [8] ), but are also adept at scraping up roots and tubers. In central Kruger National Park, Steenbok show a distinct preference for forbs, and then woody plants (especially Flueggea virosa ) when few forbs are available. [6] They will also take fruits and only very rarely graze on grass. [6] They are almost entirely independent of drinking water, gaining the moisture they need from their food.

Behaviour

Steenbok are active during the day and the night; however, during hotter periods, they rest under shade during the heat of the day. The time spent feeding at night increases in the dry season. [9] While resting, they may be busy grooming, ruminating or taking brief spells of sleep. [10]

Anti-predator

Steenbok typically lie low in vegetation cover at the first sign of threat Steenbok sitting.jpg
Steenbok typically lie low in vegetation cover at the first sign of threat

At the first sign of trouble, steenbok typically lie low in the vegetation. If a predator or perceived threat comes closer, a steenbok will leap away and follow a zigzag route to try to shake off the pursuer. Escaping steenbok frequently stop to look back, and flight is alternated with prostration during extended pursuit. They are known to take refuge in the burrows of aardvarks. Known predators include Southern African wildcat, caracal, jackals, leopard, martial eagle and pythons.

Breeding

Steenbok are typically solitary, except for when a pair come together to mate. However, it has been suggested [5] that pairs occupy consistent territories while living independently, staying in contact through scent markings, so that they know where their mate is most of the time. Scent marking is primarily through dung middens. Territories range from 4 hectares to 1 square kilometre. The male is aggressive during the female's oestrus, engaging in "bluff-and-bluster" type displays with rival males—prolonged contests invariably involve well-matched individuals, usually in their prime. [10]

Breeding occurs throughout the year, although more fawns are born November to December in the southern spring–summer; some females may breed twice a year. Gestation period is about 170 days, and usually a single precocial fawn is produced. The fawn is kept hidden in vegetation for 2 weeks, but suckles for 3 months. Females become sexually mature at 6–8 months and males at 9 months.

Steenbok are known to live for 7 years or more.

Taxonomy

Two subspecies are recognized: R. c. campestris in Southern Africa and R. c. neumanni of East Africa; although MSW3 also recognizes capricornis and kelleni. [11] Up to 24 subspecies have been described from Southern Africa, distinguished on such features as coat colour.

Notes

Related Research Articles

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Impala Medium-sized antelope found in Africa

The impala is a medium-sized antelope found in eastern and southern Africa. The only extant member of the genus Aepyceros and tribe Aepycerotini, it was first described to European audiences by German zoologist Hinrich Lichtenstein in 1812. Two subspecies are recognised—the common impala, and the larger and darker black-faced impala. The impala reaches 70–92 cm (28–36 in) at the shoulder and weighs 40–76 kg (88–168 lb). It features a glossy, reddish brown coat. The male's slender, lyre-shaped horns are 45–92 cm (18–36 in) long.

Brown hyena Species of carnivore

The brown hyena, also called strandwolf, is a species of hyena found in Namibia, Botswana, western and southern Zimbabwe, southern Mozambique and South Africa. It is the only extant species in the genus Parahyaena. It is currently the rarest species of hyena. The largest remaining brown hyena population is located in the southern Kalahari Desert and coastal areas in Southwest Africa. The global population of brown hyena is estimated by IUCN at a number between 4,000 and 10,000 and its conservation status is marked as near threatened in the IUCN Red List.

Cape fox Species of carnivore

The Cape fox, also called the asse, cama fox or the silver-backed fox, is a small species of fox, native to southern Africa. It is also called a South African version of a fennec fox due to its similarly big ears. It is the only "true fox" occurring in sub-Saharan Africa, and it retains primitive characteristics of Vulpes because it diverged early in the evolutionary history of the group.

Sitatunga Species of swamp-dwelling antelope

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Common eland Second largest antelope in the world

The common eland, also known as the southern eland or eland antelope, is a savannah and plains antelope found in East and Southern Africa. It is a species of the family Bovidae and genus Taurotragus. An adult male is around 1.6 metres (5') tall at the shoulder and can weigh up to 942 kg (2,077 lb) with an average of 500–600 kg (1,100–1,300 lb), 340–445 kg (750–981 lb) for females). It is the second largest antelope in the world, being slightly smaller on average than the giant eland. It was scientifically described by Peter Simon Pallas in 1766.

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The hartebeest, also known as kongoni or kaama, is an African antelope. It is the only member of the genus Alcelaphus. Eight subspecies have been described, including two sometimes considered to be independent species. A large antelope, the hartebeest stands just over 1 m at the shoulder, and has a typical head-and-body length of 200 to 250 cm. The weight ranges from 100 to 200 kg. It has a particularly elongated forehead and oddly-shaped horns, a short neck, and pointed ears. Its legs, which often have black markings, are unusually long. The coat is generally short and shiny. Coat colour varies by the subspecies, from the sandy brown of the western hartebeest to the chocolate brown of the Swayne's hartebeest. Both sexes of all subspecies have horns, with those of females being more slender. Horns can reach lengths of 45–70 cm (18–28 in). Apart from its long face, the large chest and the sharply sloping back differentiate the hartebeest from other antelopes. A conspicuous hump over the shoulders is due to the long dorsal processes of the vertebrae in this region.

Gerenuk Long-necked species of antelope (Litocranius walleri)

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Waterbuck Species of antelope

The waterbuck is a large antelope found widely in sub-Saharan Africa. It is placed in the genus Kobus of the family Bovidae. It was first described by Irish naturalist William Ogilby in 1833. Its 13 subspecies are grouped under two varieties: the common or ellipsiprymnus waterbuck and the defassa waterbuck. The head-and-body length is typically between 177 and 235 cm and the typical height is between 120 and 136 cm. In this sexually dimorphic antelope, males are taller and heavier than females. Males reach roughly 127 cm (50 in) at the shoulder, while females reach 119 cm (47 in). Males typically weigh 198–262 kg (437–578 lb) and females 161–214 kg (355–472 lb). Their coat colour varies from brown to grey. The long, spiral horns, present only on males, curve backward, then forward, and are 55–99 cm (22–39 in) long.

Royal antelope Species of mammal

The royal antelope is a West African antelope, recognized as the world's smallest antelope. It was first described by Swedish zoologist Carl Linnaeus in 1758. It stands up to merely 25 centimetres (10 in) at the shoulder and weighs 2.5–3 kilograms (5.5–6.6 lb). A characteristic feature is the long and slender legs, with the hindlegs twice as long as the forelegs. Horns are possessed only by males; the short, smooth, spiky horns measure 2.5–3 centimetres (1.0–1.2 in) and bend backward. The soft coat is reddish to golden brown, in sharp contrast with the white ventral parts. In comparison to Bates's pygmy antelope, the royal antelope has a longer muzzle, broader lips, a smaller mouth and smaller cheek muscles.

Blackbuck Antelope native to India and Nepal

The blackbuck, also known as the Indian antelope, is an antelope native to India and Nepal. It inhabits grassy plains and lightly forested areas with perennial water sources. It stands up to 74 to 84 cm high at the shoulder. Males weigh 20–57 kg (44–126 lb), with an average of 38 kg (84 lb). Females are lighter, weighing 20–33 kg (44–73 lb) or 27 kg (60 lb) on average. Males have 35–75 cm (14–30 in) long, ringed horns, though females may develop horns as well. The white fur on the chin and around the eyes is in sharp contrast with the black stripes on the face. The coats of males show a two-tone colouration; while the upper parts and outsides of the legs are dark brown to black, the underparts and the insides of the legs are white. Females and juveniles are yellowish fawn to tan. The blackbuck is the sole living member of the genus Antilope and was scientifically described by Carl Linnaeus in 1758. Two subspecies are recognized.

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Thomson's gazelle is one of the best-known gazelles. It is named after explorer Joseph Thomson and is sometimes referred to as a "tommie". It is considered by some to be a subspecies of the red-fronted gazelle and was formerly considered a member of the genus Gazella within the subgenus Eudorcas, before Eudorcas was elevated to genus status. Thomson's gazelles can be found in numbers exceeding 200,000 in Africa and are recognized as the most common type of gazelle in East Africa. The Thomson's gazelle can reach speeds of 80–90 km/h (50–55 mph). It is the fourth-fastest land animal, after the cheetah, pronghorn, and springbok.

Oribi Species of mammal

The oribi is a small antelope found in eastern, southern and western Africa. The sole member of its genus, it was described by the German zoologist Eberhard August Wilhelm von Zimmermann in 1783. Eight subspecies are identified. The oribi reaches nearly 50–67 centimetres (20–26 in) at the shoulder and weighs 12–22 kilograms (26–49 lb). It possesses a slightly raised back, and long neck and limbs. The glossy, yellowish to rufous brown coat contrasts with the white chin, throat, underparts and rump. Only males possess horns; the thin, straight horns, 8–18 centimetres (3.1–7.1 in) long, are smooth at the tips and ringed at the base.

Blue wildebeest Species of mammal

The blue wildebeest, also called the common wildebeest, white-bearded wildebeest, white-bearded gnu or brindled gnu, is a large antelope and one of the two species of wildebeest. It is placed in the genus Connochaetes and family Bovidae, and has a close taxonomic relationship with the black wildebeest. The blue wildebeest is known to have five subspecies. This broad-shouldered antelope has a muscular, front-heavy appearance, with a distinctive, robust muzzle. Young blue wildebeest are born tawny brown, and begin to take on their adult coloration at the age of 2 months. The adults' hues range from a deep slate or bluish-gray to light gray or even grayish-brown. Both sexes possess a pair of large curved horns.

Sharpes grysbok Species of mammal

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<i>Raphicerus</i> Genus of mammals

Raphicerus is a genus of small antelopes of the tribe Neotragini.

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Mongalla gazelle Species of mammal

The Mongalla gazelle is a species of gazelle found in the floodplain and savanna of South Sudan. It was first described by British zoologist Walter Rothschild in 1903. The taxonomic status of the Mongalla gazelle is widely disputed. While some authorities consider it a full-fledged monotypic species in the genus Eudorcas, it is often considered a subspecies of Thomson's gazelle, while other authorities regard it as subspecies of the red-fronted gazelle.

Preorbital gland Paired exocrine gland in many hoofed animals

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References

  1. IUCN SSC Antelope Specialist Group (2016). "Raphicerus campestris". IUCN Red List of Threatened Species . 2016: e.T19308A50193533. doi: 10.2305/IUCN.UK.2016-1.RLTS.T19308A50193533.en . Retrieved 12 November 2021.
  2. 1 2 Williams, John G. 1967. A Field Guide to the National Parks of East Africa. Collins, London. ( ISBN   0-00-219294-2)
  3. "steenbok". The Chambers Dictionary (9th ed.). Chambers. 2003. ISBN   0-550-10105-5.
  4. Matthee, Conrad A.; Scott K. Davis (2001). "Molecular Insights into the Evolution of the Family Bovidae: A Nuclear DNA Perspective" (PDF). Molecular Biology and Evolution. Society for Molecular Biology and Evolution. 18 (7): 1220–1230. doi: 10.1093/oxfordjournals.molbev.a003908 . PMID   11420362 . Retrieved 2007-06-17.
  5. 1 2 Kingdon, Jonathan. 1997. The Kingdon Field Guide to African Mammals. Academic Press, San Diego & London. Pp. 387–388. ( ISBN   0-12-408355-2)
  6. 1 2 3 Du Toit, Johan T (1993). "The feeding ecology of a very small ruminant, the steenbok (Raphicerus campestris)". African Journal of Ecology. 31: 35–48. doi:10.1111/j.1365-2028.1993.tb00516.x.
  7. Kleiman, David G. et al., Eds. 2003. Grzimek's Animal Life Encyclopedia, 2nd edn. Vol. 16: Mammals V. Gale Cengage Learning. Pp. 59–72.
  8. Du Toit, J.T. (1990). "Feeding-height stratification among African browsing ruminants". African Journal of Ecology. 28: 55–61. doi:10.1111/j.1365-2028.1990.tb01136.x.
  9. Smithers, Reay H.N. (2000). Apps, Peter (ed.). Smithers' Mammals of Southern Africa. A field guide. Cape Town: Struik publishers. p. 197. ISBN   1868725502.
  10. 1 2 Cohen, Michael. 1976. The Steenbok: A neglected species. Custos (April 1976): 23–26.
  11. Grubb, P. (2005). "Order Artiodactyla". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. p. 688. ISBN   978-0-8018-8221-0. OCLC   62265494.