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Oryx
INFORMATIE:
Swahili Name: Choroa
Scientific Name: Oryx gazella
Size: 47 inches at the shoulder
Weight: 250 to 390 pounds
Lifespan: 20 years
Habitat: Dry plains
Diet: Herbivorous/grazer
Gestation: 8 1/2 months
Predators: Lions, hyenas, wild dogs

 

Kenya's Tana River divides the range of East Africa's two types of oryx the beisa oryx (Oryx g. beisa) and the fringe-eared oryx (Oryx g. callotis). The fringe-eared oryx ranges from Kenya to central Tanzania. The beisa oryx ranges from Ethiopia through Somalia into northeastern Uganda and Kenya.

Fysieke kenmerken

The oryx is a large antelope of striking appearance with long, spearlike horns. It has a thick, horselike neck with a short mane and a compact, muscular body. A defined pattern of black markings that contrast with the white face and fawn-colored body are prominently displayed in dominance rituals to emphasize the length of horns and strength of the shoulder.

The head is marked with black triangular patches and broad black stripes that extend from the base of the horns over the eyes to the cheeks. A ring of black encircles the throat and runs down the neck to the chest. The ears end in a black tip (a black tassel hangs from the ear tip of the fringe-eared oryx). A narrow black stripe runs along the spine, and another one separates the lower flank from the white underparts of the body. The white forelegs have a black ring above the knee and a black patch below. The black tail tassel reaches to the hocks.

The oryx's ringed horns are up to 30 inches long, making them formidable weapons. The female's horns are often longer and thinner than the male's.

Habitat

Originally, various oryx species were found in all of Africa's arid regions. One species that occurred on the Arabian Peninsula was exterminated recently but has now been reintroduced into the wild from captive stock. Well adapted to the conditions of their hot, arid habitats, oryx can live as long as 20 years.

Het gedrag

The social system of the oryx is unusual in that nonterritorial males live in mixed groups with females, or with females and their young. Males that dominate are territorial to a degree, marking their areas with dung deposits. Groups are composed of 10 to 40 males and females of all ages and both sexes; herds of up to 200 are common in some East African habitats.

The dominance hierarchy among oryx is based on age and size. As they grow, calves test one another in what look like games, though in reality are tests of strength. As the hierarchy becomes established, the need to fight is reduced. Ritual displays replace actual contact, except when evenly matched individuals may have to fight to establish their rank. Along with lateral displays, oryx perform a slow, prancing walk and sometimes break into a gallop. When several males are making these displays, they may clash horns.

Herd composition in the wild constantly changes according to need. Oryx wanting to drink, for example, form a group to go to water, or females with young form a group that moves more slowly. The result is a social system that allows for individual needs but retains the advantage of group living. Oryx range widely over a large area, but their keen sense of smell alerts them to rain in the area, so that groups quickly assemble, often in herds of 200 or more, to feed on new growth.

Dieet

Oryx typically feed in early morning and late afternoon and sometimes on moonlit nights. Their diets consists mainly of coarse grasses and browse from thorny shrubs. In desert areas they consume thick leaved plants, wild melons, as well as roots and tubers they dig out of the ground. They may drink if water is available but can survive days or even weeks without it.

Plants growing in arid areas inhabited by oryx have also adapted to the hot, dry conditions and either store water or have mechanisms to prevent excess loss. Plants collect dew, gradually releasing it during the hotter parts of the day. Some plants increase their water content by 25 to 40 percent, so when oryx feed late at night or early in the morning, it provides them with both food and water.

Zorg voor jonge dieren

A female leaves the herd to give birth and hides the calf for 2 or 3 weeks, visiting a few times a day to nurse it. The newborn is an inconspicuous brown color. The black markings begin to appear when the calf is ready to return to herd with its mother. Calves are suckled for 6 to 9 months and reach maturity at 18 to 24 months. Most young males migrate out of their natal group to join other groups.

Roofdieren

Like other antelope species, oryx primarily depend on flight to escape from predators such as lions, wild dogs and hyenas.

Wist je dat?

  • The oryx is a good example of an antelope that has successfully adapted to the harsh conditions of dispersed food, intense heat and little or no water.
  • The female comes into heat soon after giving birth. The more frequent estrus cycles enable females to produce calves at 9-month intervals.


copyright: Paul Janssen