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The addax is a spiral-horned antelope. Male addaxes stand from 105 to 115 cm (41 to 45 in) at the shoulder, with females at 95 to 110 cm (37 to 43 in). They are sexually dimorphic , as the females are smaller than the males. [ 11 ]
Male in the Kruger National Park. The nyala is a spiral-horned and middle-sized antelope, between a bushbuck and a kudu. [16] It is considered the most sexually dimorphic antelope. [2] The nyala is typically between 135–195 cm (53–77 in) in head-and-body length. [2] The male stands up to 110 cm (43 in), the female is up to 90 cm (3.0 ft) tall.
Though not an antelope, it is known colloquially in North America as the American antelope, prong buck, pronghorn antelope and prairie antelope, [5] because it closely resembles the antelopes of the Old World and fills a similar ecological niche due to parallel evolution. [6] It is the only surviving member of the family Antilocapridae. [7]
juvenile young male. The mountain nyala (Amharic: የተራራ ኒዮላ) (Tragelaphus buxtoni) or balbok, is a large antelope found in high altitude woodlands in a small part of central Ethiopia. It is a monotypic species (without any identified subspecies) first described by English naturalist Richard Lydekker in 1910. The males are typically ...
The long, spiral horns curve backward, then forward. Found only on males, the horns range from 55 to 99 cm (22 to 39 in) in length. [12] To some extent, the length of the horns is related to the bull's age. A rudimentary horn in the form of a bone lump may be found on the skulls of females. [13]
The spiral-horned antelopes belong to the subfamily Bovinae which also includes oxen of the tribe Bovini and two aberrant species of Asian antelope, the four-horned antelope and the nilgai which belong to the tribe Boselaphini. The relationship between the tribes varies in research concerning their phylogeny.
The giant elands are spiral-horned antelopes. Despite its common name, this species broadly overlaps in size with the common eland ( Taurotragus oryx ). However, the giant eland is somewhat larger on average than the common eland and is thus the largest species of antelope in the world.
The IUCN Antelope Specialist Group considers the western or lowland bongo, T. e. eurycerus, to be Lower Risk (Near Threatened) [2] and the eastern or mountain bongo, T. e. isaaci, of Kenya, to be Critically Endangered. [4] These bongos may be endangered due to human environmental interaction, as well as hunting and illegal actions towards wildlife.