Fringe-eared oryx | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Artiodactyla |
Family: | Bovidae |
Subfamily: | Hippotraginae |
Genus: | Oryx |
Species: | |
Subspecies: | O. b. callotis |
Trinomial name | |
Oryx beisa callotis (Thomas, 1892) | |
Fringe-eared and common oryx ranges. [2] | |
Synonyms | |
Oryx callotis Thomas, 1892 |
The fringe-eared oryx (Oryx callotis [3] or Oryx beisa callotis), is a large species or subspecies of oryx antelope native to East Africa.
It was originally described as a distinct species by Oldfield Thomas in 1892, but was subsequently re-evaluated as a subspecies of the East African oryx by Richard Lydekker in 1912. [4] Recently, however, analysis using the phylogenetic species concept has led some authors to conclude that it should be returned to full species status. [3]
Fringe-eared oryxes are relatively muscular antelopes with short, slender legs. Adults are 153 to 170 cm (60 to 67 in) in head-body length, with a tail 45 to 50 cm (18 to 20 in) long, and stand 110 to 120 cm (43 to 47 in) tall at the shoulder. Males are heavier, weighing 167 to 209 kg (368 to 461 lb), compared with 116 to 188 kg (256 to 414 lb) for females, but the two sexes are otherwise difficult to distinguish. The hair is fawn-coloured across almost the entire body, with a black stripe down the flanks. There are also black bands on the front and side of the face, and down the throat, while the muzzle is white. There is a short mane of brownish hair, as well as tufts of black hair above the hooves, at the end of the tail, and on the ears. It is from the last feature, unique among the various kinds of oryx, that the subspecies gains its common name. [4]
The horns are 76 to 81 cm (30 to 32 in) long, and almost straight, with only a slight backwards curve. Unlike in most other hippotragine antelopes, but like those of other oryxes, those of the fringe-eared oryx are parallel with the upper surface of the animal's snout. The horns are similar in males and females, and have an average of 16 rings around the lower half, before smoothly tapering to a point. [4]
Fringe-eared oryxes are found only in southeastern Kenya and northeastern Tanzania. Although previously not found within the present-day boundaries of the Serengeti National Park, herds of fringe-eared oryx began moving into that area in 1972, [5] where they still remain. They inhabit semi-arid grasslands, scrubland, and Acacia woodland, [6] being most common in areas with an annual rainfall of 40 to 80 centimetres (16 to 31 in) per year. [4] Predictions by the IUCN indicate that they may soon become restricted to national parks and similarly protected areas, due to pressure from poachers and habitat loss due to agriculture outside such areas. [1]
Over 80% of the fringe-eared oryx's diet consists of grasses. During the wet season, these are supplemented with herbs such as dayflowers and Indigofera , while in the dry season, the oryxes instead eat the tubers and stems of Pyrenacantha malvifolia and other succulent plants that help to provide the animals with water. [4] [7] By using such strategies, fringe-eared oryxes have been reported to survive for up to a month without drinking, although they will do so when the opportunity arises. [8] In addition, oryxes have the ability to produce highly concentrated urine, and to re-absorb significant amounts of water from their food. [4]
Fringe-eared oryxes travel in nomadic herds, typically composed of 30 to 40 individuals. Herds have a home range of 300 to 400 km2 (120 to 150 sq mi), within which the animals move in search of green vegetation. Most adult members of the herd are female, but it is the males who are mainly responsible for directing its movement. When moving in single file, for example, dominant males bring up the rear, and speed up or slow down the females in front of them, [5] as well as blocking any that try to move away. [9]
Within the herd, animals of both sexes establish a clear pattern of dominance. Challenges to reinforce and test this hierarchy begin with animals galloping in a broad circle with a high-stepping movement and swinging the head from side to side. More active fights consist primarily of clashing with the horns, but also involve pushing with the horns or forehead. The loser in such fights may be pushed back up to 30 metres (98 ft), but the animals do not attempt to gore one another or cause serious injury. [5]
Predators of fringe-eared oryxes include lions, cheetahs, and leopards. Oryxes have been reported to use water holes in the company of various other ungulates, and primarily during the daylight hours, in order to reduce the chance of predation, and to give snorting alarm calls if any potential predators are spotted. [4] Otherwise, they graze in the early morning and in the evening, resting and ruminating during the heat of the day, and also grazing intermittently during the night. [5] They also spend a considerable amount of time grooming each other with their teeth and tongues, and, as a result, have been reported to suffer less with infestation by ticks than animals such as wildebeest, that groom less often. [10]
Breeding occurs throughout the year, although young are more commonly born in the dry season than at other times. Males may form territories within which they attempt to control females, and prevent other males from mating, but this tactic meets with only limited success, so that even non-territorial males have some chance at mating. Single young are born after a gestation period of around nine months, and weigh between 9 and 10 kg (20 and 22 lb) at birth. [4]
The mother moves away from the herd before giving birth, and keeps her infant hidden for up to three weeks, before rejoining the herd shortly thereafter. They are able to breed again almost immediately, and can therefore give birth every 11 months under ideal circumstances. [8] Young are sexually mature by 18 to 24 months of age. [4] Fringe-eared oryxes have lived for up to 22 years in captivity. [11]
The bongo is a large, mostly nocturnal, forest-dwelling antelope, native to sub-Saharan Africa. Bongos are characterised by a striking reddish-brown coat, black and white markings, white-yellow stripes, and long slightly spiralled horns. It is the only tragelaphid in which both sexes have horns. Bongos have a complex social interaction and are found in African dense forest mosaics. They are the third-largest antelope in the world.
The impala or rooibok 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 Europeans by German zoologist Hinrich Lichtenstein in 1812. Two subspecies are recognised—the grassland-dwelling common impala, and the larger and darker black-faced impala, which lives in slightly more arid, scrubland environments. 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.
Oryx is a genus consisting of four large antelope species called oryxes. Their pelage is pale with contrasting dark markings in the face and on the legs, and their long horns are almost straight. The exception is the scimitar oryx, which lacks dark markings on the legs, only has faint dark markings on the head, has an ochre neck, and has horns that are clearly decurved.
The greater kudu is a large woodland antelope, found throughout eastern and southern Africa. Despite occupying such widespread territory, they are sparsely populated in most areas due to declining habitat, deforestation, and poaching. The greater kudu is one of two species commonly known as kudu, the other being the lesser kudu, T. imberbis.
The common eland, also known as the southern eland or eland antelope, is a large-sized savannah and plains antelope found in East and Southern Africa. An adult male is around 1.6 m (5.2 ft) tall at the shoulder and can weigh up to 942 kg (2,077 lb) with a typical range of 500–600 kg (1,100–1,300 lb), 340–445 kg (750–981 lb) for females).
The roan antelope is a large savanna-dwelling antelope found in western, central, and southern Africa. Named for its roan colour, it has lighter underbellies, white eyebrows and cheeks and black faces, lighter in females. It has short, erect manes, very light beards and prominent red nostrils. It is one of the largest antelope, measuring 190–240 cm (75–94 in) from head to the base of the tail, and a 37–48 cm (15–19 in) long tail. Males weigh 242–300 kg (534–661 lb) and females 223–280 kg (492–617 lb). Its shoulder height is around 130–140 cm (51–55 in).
The East African oryx, also known as the beisa, is a species of medium-sized antelope from East Africa. It has two subspecies: the common beisa oryx found in steppe and semidesert throughout the Horn of Africa and north of the Tana River, and the fringe-eared oryx south of the Tana River in southern Kenya and parts of Tanzania. The species is listed as Endangered by the IUCN.
The scimitar oryx, also known as the scimitar-horned oryx and the Sahara oryx, is an Oryx species that was once widespread across North Africa. In 2000, it was declared extinct in the wild on the IUCN Red List, but in 2023 it was downlisted to endangered. This particular oryx is adapted to harsh desert conditions and can survive for months or even years without drinking water. A grazing animal, it derives most of its daily moisture intake from plants.
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.
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.
The bohor reedbuck is an antelope native to central Africa. The animal is placed under the genus Redunca and in the family Bovidae. It was first described by German zoologist and botanist Peter Simon Pallas in 1767. The bohor reedbuck has five subspecies. The head-and-body length of this medium-sized antelope is typically between 100–135 cm (39–53 in). Males reach approximately 75–89 cm (30–35 in) at the shoulder, while females reach 69–76 cm (27–30 in). Males typically weigh 43–65 kg (95–143 lb) and females 35–45 kg (77–99 lb). This sturdily built antelope has a yellow to grayish brown coat. Only the males possess horns which measure about 25–35 cm (9.8–13.8 in) long.
Thomson's gazelle is one of the best known species of 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.
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. While this is the only member in the genus Ourebia, 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.
The gemsbok, or South African oryx, is a large antelope in the genus Oryx. It is endemic to the dry and barren regions of Botswana, Namibia, South Africa and Zimbabwe, mainly inhabiting the Kalahari and Namib Deserts, areas in which it is supremely adapted for survival. Previously, some sources classified the related East African oryx, or beisa oryx, as a subspecies.
The mountain reedbuck is an antelope found in mountainous areas of much of sub-Saharan Africa.
The blue wildebeest, also called the common 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.
Damaliscus lunatus is a large African antelope of the genus Damaliscus and subfamily Alcelaphinae in the family Bovidae, with a number of recognised geographic subspecies. Some authorities have split the different populations of the species into different species, although this is seen as controversial. Common names include topi, sassaby, tiang and tsessebe.
Grant's gazelle is a relatively large species of gazelle antelope, distributed from northern Tanzania to South Sudan and Ethiopia, and from the Kenyan coast to Lake Victoria. Its Swahili name is swala granti. It was named for a 19th-century British explorer, James Grant.
Damaliscus lunatus jimela is a subspecies of topi, and is usually just called a topi. It is a highly social and fast type of antelope found in the savannas, semi-deserts, and floodplains of sub-Saharan Africa.
The common beisa oryx, also known as the beisa oryx, is the nominate subspecies of the East African oryx native to the Horn of Africa and Kenya. It is closely related to the fringe-eared oryx. There are four species of oryx, one of which has two distinct subspecies. Although they are very similar in appearance, they have a number of distinct characteristics that allow identification. Common beisa oryx have fringed ears and black tufts of hair that extend past their ears. However, all species of oryx are compact and muscular, with relative long bodies and broad necks. There are not any marked difference between male and female oryx. The common beisa oryx enjoys feeding on a variety of grass species. They feed during the day, when the plants hold the most water. During the dry season, they feed on poisonous Adenium plants.