See text The oribi (/ˈɔːrəbi/; Ourebia ourebi) is a small antelope found in eastern, southern and western Africa.

The glossy, yellowish to rufous brown coat contrasts with the white chin, throat, underparts and rump.

Unlike all other small antelopes, oribi can exhibit three types of mating systems, depending on the habitat – polyandry, polygyny and polygynandry.

Gestation lasts for six to seven months, following which a single calf is born; births peak from November to December in southern Africa.

This antelope is highly sporadic in distribution, ranging from Senegal in the west to Ethiopia and Eritrea in the east and southward to Angola and the Eastern Cape (South Africa).

The oribi has been classified as Least Concern by the IUCN; numbers have declined due to agricultural expansion and competition from livestock.

[5][6] In a revision of the phylogeny of the tribe Antilopini on the basis of nuclear and mitochondrial data in 2013, Eva Verena Bärmann (of the University of Cambridge) and colleagues showed that the oribi is the sister taxon to all other antilopines.

[7] Oribi (Ourebia ourebi) Saiga (Saiga tatarica) Gerenuk (Litocranius walleri) Springbok (Antidorcas marsupialis) Eudorcas Nanger Gazella Blackbuck (Antilope cervicapra) Procapra Raphicerus Madoqua Dorcatragus The following eight subspecies are identified:[1][8][9] Of these, zoologists Colin Groves and Peter Grubb identify O. o. hastata, O. o. montana, O. o. ourebi and O. o. quadriscopa as independent species in their 2011 publication Ungulate Taxonomy.

The glossy, yellowish to rufous brown coat contrasts with the white chin, throat, underparts and rump.

[14] A study suggested that polygyny is preferred in areas of high predator risk, as it leads to formation of groups as an anti-predator measure.

[12] Males defend their group's territory, 25–100 hectares (62–247 acres) large; female members may also show some aggression and drive away intruders.

Grasses can constitute up to 90% of the diet; preferred varieties include Andropogon, Eulalia, Hyparrhenia, Loudetia, Pennisetum and Themeda species.

During courtship, the male will pursue the female, test her urine to check if she is in oestrus and lick her rump and flanks.

[4] Gestation lasts for six to seven months, following which a single calf is born; births peak from November to December in southern Africa.

The oribi's range overlaps with those of larger grazers such as the African buffalo, hippopotamus, hartebeest, Thomson's gazelle and topi.

[1] However, the subspecies O. o. haggardi is listed as Vulnerable because, as of 2008, the total population is estimated at less than 10,000 mature individuals, and is feared to be declining.