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Oribi
Ourebia ourebiThe delicate grazer of the tall grass.
The oribi is the most gazelle-like of the small antelopes - slender, long-necked and built for the tall grass. Unlike the browser steenbok, the oribi is a grazer that depends on rank grassland for both food and cover. It lives in small pairs or trios, whistles an alarm when danger looms, and bursts away in a zigzag dash. Males alone carry the short straight horns.
Oribi Quick Facts
What Is the Oribi?
The oribi (Ourebia ourebi) is the sole member of its genus and the most gazelle-like of the small "dwarf antelopes" (tribe Neotragini, alongside the steenbok, klipspringer and dik-dik). It is a slender, long-necked grazer of rank grassland - the opposite niche to the browser steenbok.
Its range is patchy across eastern, southern and western Africa, not just Tanzanian. Oribi occur from Senegal in the west to Ethiopia and Eritrea in the east, and southward through East Africa to Angola and South Africa. Tanzania holds them in higher-rainfall grasslands of the north and south, but the species is pan-African in suitable tall grass.
Why “Oribi”?
"Oribi" is the animal's common name across its African range (pronounced OH-ruh-bee). The scientific name, Ourebia ourebi, is a tautonym - the genus and species are the same word - and the genus is monospecific, containing only this one antelope.
Signature Features
An oribi is small, slender and delicate, with a slightly raised back, long neck and long legs, and large upright ears. The coat is glossy yellowish- to rufous-brown, set off by white chin, throat, underparts and rump, a white line over each eye, and a bare dark patch below the ear. Tufts of long hair sit on the "knees" of the front legs, and the bushy tail is dark outside, white inside.
Only males carry horns: short, straight and slender, smooth at the tips and ringed at the base, 8-19 cm. Females are usually hornless. Big preorbital glands show as vertical folds on the face.
How Big Is an Oribi?
Oribi stand about 50-67 cm at the shoulder and weigh 12-22 kg - a little larger and leggier than a steenbok, and the biggest of the common small antelopes you will meet on Tanzanian grassland.
Horns & Defence
The horns are a male-only feature: thin, straight and erect, 8-19 cm, ringed at the base and smooth at the tip. The male uses them in defence of his territory and in sparring with rival males; the female has none.
Habitat & Range
Oribi are an open-grassland species above all. They favour open grassland with short grass, patches of taller grass for cover, and a few scattered bushes, and they avoid steep slopes. They use lightly wooded grassland and the edges of floodplains rather than dense bush or open plain, because they need rank grassland for both food and cover. This ties them to higher-rainfall zones and makes them avoid overgrazed or bushy country. They actually benefit from controlled burning: after a fire they return to graze the fresh green regrowth, and recently burnt areas often draw small groups of oribi.
Oribi in Tanzania
Within Tanzania, oribi favour the tall-grass plains of the Serengeti and the grasslands of Tarangire and other northern circuits, plus higher-rainfall southern grasslands. But the species ranges from Senegal to South Africa, so an oribi is never a Tanzania-only animal.
Serengeti, Tanzania
Tall-grass plains and recently burnt sweeps hold oribi; watch for the white eye-line and upright posture.
Serengeti safariTarangire, Tanzania
Grassland and floodplain margins suit oribi, especially after seasonal burns.
Tarangire safariKatavi, Tanzania
Miombo-woodland floodplains and grasslands in the remote south hold oribi too.
Katavi safariThe wider range
From Senegal and Ethiopia south to Angola and South Africa - wherever tall grassland persists.
Behavior & Social Life
Oribi are usually solitary or occur as territorial pairs. Small groups of up to about six can occur occasionally, but they do not form large, permanent herds. Adult males establish and defend territories, marking grass with preorbital-gland secretion and patrolling the boundary; depending on habitat a male may be monogamous or, unusually for a small antelope, hold more than one female.
Oribi are mainly active during daylight, with activity influenced by temperature and local conditions. At alarm an oribi gives a sharp whistling call (males whistle most), may stot (vertical stiff-legged leaps), then bursts away in a zigzag, bounding dash at 40-50 km/h, or drops flat in the grass. They also visit mineral licks.
Diet & Feeding
The oribi is primarily a grazer: it prefers fresh, nutritious grasses and will also take herbs, leaves, flowers and the occasional browse, plus minerals at licks. This is the key split from the browser steenbok - the oribi eats grass and depends on tall grassland, while the steenbok browses leaves and roots on open plains.
Predators & Defense
As a small grazer in the open, the oribi is prey for lions, leopards, cheetahs, spotted hyenas, African wild dogs and jackals, plus raptors taking calves. Its defences are vigilance, the alarm whistle, stotting, and a fast zigzag flight into tall cover rather than a long chase.
Young & Lifespan
After a gestation of about 6-7 months, a single calf is born; newborns are dark brown and hidden in the grass for about a month, visited by the mother to nurse. The calf grows fast, reaching adult size by a year and weaned at 4-5 months. Lifespan is 8-14 years in the wild.
Conservation Status
The oribi is listed Least Concern on the IUCN Red List, with a population around 750,000 - but the trend is decreasing. The threats are exactly its needs in reverse: agricultural expansion, overgrazing by livestock, altered fire regimes and hunting shrink and degrade the tall grassland it depends on. Protecting rank grassland in and around parks is what keeps oribi common.
Safari Experience
For a Tanzania safari, oribi are a grassland reward of the Serengeti and Tarangire plains - look for a small, pale, long-necked antelope with a white eye-stripe standing erect in the grass. Recently burnt sweeps are a good place to find them grazing regrowth. They are Least Concern but declining, so a sighting is best enjoyed with a guide who respects the tall grass they need.
Comparisons
Two small Tanzanian antelopes are easy to mix up. The oribi and the steenbok look alike at distance, but their ecology is opposite:
| Feature | Oribi | Steenbok |
|---|---|---|
| Diet | Grazer (fresh grass) | Browser (leaves, roots, fruit) |
| Habitat | Open grassland, tall grass | Open plains & scrub |
| Horns | Males only (straight, 8-19 cm) | Males only (straight, 7-19 cm) |
| Social | Pairs / trios; territorial male | Solitary pairs |
| Alarm | Whistle + stot + zigzag dash | Freeze, then zigzag & drop |
| Build | Long neck/legs, rufous | Compact, rufous-orange |
Did You Know?
Whistle alarm
When alarmed an oribi gives a sharp whistling call - mostly the male - that startles predators and warns the group.
Loves fresh burns
It is one of the few mammals that benefits from wildfire, returning to graze the tender green regrowth on burnt grassland.
Males only horned
Only the male oribi carries the short, straight, base-ringed horns; females are hornless.
A grazer, not a browser
Unlike the steenbok, the oribi eats grass and depends on tall rank grassland for food and cover.
Flexible mating
It can be monogamous, polygynous or even polyandrous depending on habitat - unusual for a small antelope.
Least Concern, but falling
About 750,000 remain, yet the trend is downward as tall grassland is ploughed and overgrazed.
On the Serengeti after the burns the grass comes back the colour of new money, and the oribi are already there - small, pale, whistling. They ask so little: tall grass, rain, and the right fire at the right time. Take those away and the most gazelle-like of the little antelopes simply stops being. It is a quiet lesson in how much a whole animal can hang on a single kind of grass.
Gallery
Frequently Asked Questions
Ourebia ourebi. It is the only species in its genus and sits among the small "dwarf antelopes" (tribe Neotragini).
Across eastern, southern and western Africa: from Senegal to Ethiopia and Eritrea, south through East Africa to Angola and South Africa. Tanzania holds them in higher-rainfall grasslands, but the range is pan-African.
Yes - in the tall-grass plains of the Serengeti, the grasslands of Tarangire, and southern floodplain grasslands such as Katavi. They need rank grassland, so they avoid overgrazed or bushy ground.
They are grazers that prefer fresh grass, also taking herbs, leaves, flowers and minerals at licks. This is the opposite of the browser steenbok.
Oribi are grazers of tall grassland in small pairs/trios that whistle and zigzag; steenbok are browsers of open plains in solitary pairs that freeze and drop. Both have male-only straight horns.
No - only males. The horns are short, straight, ringed at the base and 8-19 cm; females are hornless.
They whistle an alarm, may stot (stiff-legged leaps), then burst away in a zigzag dash at 40-50 km/h into tall grass, or hide flat. The calf is concealed in grass for about a month.
Lions, leopards, cheetahs, spotted hyenas, African wild dogs, jackals and raptors (calves).
Usually pairs or trios (a territorial male with one or two females), sometimes singly; small herds up to four. The male defends a 25-100 ha territory.
They stand about 50-67 cm at the shoulder and weigh 12-22 kg - the largest of the common small antelopes.
Least Concern (~750,000 animals) but decreasing, pressured by farmland expansion, livestock overgrazing, altered fire regimes and hunting.
References & Further Reading
- Animalia.bio - Oribi: Ourebia ourebi, sole genus member; 50-67 cm, 12-22 kg; males-only straight horns 8-18 cm ringed at base; grazer of fresh grass; Least Concern (~750,000) but declining; range Senegal-Ethiopia to Angola/South Africa.
- Animal Diversity Web - Ourebia ourebi: patchy grasslands of central/southern Africa to Tanzania; short+tall grass with cover; males 8-19 cm horns; monogamous-polygynous; lifespan 8-12 yrs; Least Concern.
- A-Z Animals - Oribi: 51-67 cm, 12-22 kg; males short straight ringed horns 8-18 cm, females hornless; grazer of fresh regrowth; territorial pairs; whistle alarm; 31 mph dash; Least Concern (decreasing).
- Britannica - Oribi: dependent on tall grass for food/cover, higher-rainfall zones; pairs/small herds; zigzag dash 25-30 mph; newborn dark brown hidden ~1 month; most gazelle-like dwarf antelope.
- African Wild Trekkers - Oribi: 12-22 kg, 50-67 cm; males-only horns 8-19 cm; grazer; Tanzania northern/southern grasslands.
- Wikipedia - Oribi: Ourebia ourebi; eastern/southern/western Africa; stotting; mineral licks; benefits from recent burns.
