Steenbok Evolution Tree

The steenbok (''Raphicerus campestris'') is a common small antelope of southern and eastern Africa. It is sometimes known as the steinbuck or steinbok.

Description

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, 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.Kingdon, Jonathan. 1997. ''The Kingdon Field Guide to African Mammals''. Academic Press, San Diego & London. Pp. 387–388. () 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).

Population density is typically 0.3–1.0 individuals per square kilometre, reaching 4 per km² in optimal habitats.Kleiman, David G. ''et al.'', Eds. 2003. ''Grzimek's Animal Life Encyclopedia'', 2nd edn. Vol. 16: Mammals V. Gale Cengage Learning. Pp. 59–72.

Diet

Steenbok typically browse on low-level vegetation (they cannot reach above 0.9 m), 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. They will also take fruits and only very rarely graze on grass. 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. While resting, they may be busy grooming, ruminating or taking brief spells of sleep.

Anti-predator

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 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.Cohen, Michael. 1976. The Steenbok: A neglected species. ''Custos'' (April 1976): 23–26.

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''. Up to 24 subspecies have been described from Southern Africa, distinguished on such features as coat colour.

Gallery

Steenbok female.jpg , Female in South Africa
Steenbok (Raphicerus campestris) male.jpg, Backlit male showing white fur in ears, Tswalu Kalahari Res.
Steenbok (Raphicerus campestris) running composite.jpg, Female running in Damaraland, Namibia

Notes

References

External links

Wild About You (info and image)

{{Taxonbar, from=Q368033

Dwarf antelopes
Fauna of East Africa
Mammals of Angola
Mammals of Botswana
Mammals of Kenya
Mammals of Mozambique
Mammals of Namibia
Mammals of South Africa
Mammals of Eswatini
Mammals of Tanzania
Mammals of Zambia
Mammals described in 1811