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Addax

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The addax, scientifically known as *Addax nasomaculatus*, is a unique antelope native to the Sahara.

Addax - IZE-106w
Addax - IZE-106w

It is the only member of its genus. This animal is often called the white antelope or the screwhorn antelope. These names highlight its most striking feature: long, spiraling horns. Both males and females possess these horns, which feature two to three twists. The lower and middle parts of the horns also have 30 to 35 ring-shaped ridges. Because it is so specialized for desert life, the addax is currently listed as critically endangered on the IUCN Red List.

To survive in arid regions, the addax has developed remarkable biological mechanisms. It can live without drinking free water for almost indefinite periods. Instead, it extracts moisture from the plants it eats and the dew that condenses on vegetation. Scientists believe the addax has a special lining in its stomach. This lining may contain pouches that store water for use during dehydration. To conserve what little moisture it has, the animal produces highly concentrated urine.

Addax-1-Zachi-Evenor
Addax-1-Zachi-Evenor

Furthermore, its digestive tract has a long food retention time. This is likely an adaptation to a diet of slow-fermenting grasses and helps with water-saving through low water turnover.

The addax's physical appearance changes with the seasons to help with thermoregulation. In the winter, its coat is a greyish-brown color with white hindquarters and legs. During this time, it also has long, brown hair on its head, neck, and shoulders. In the summer, the coat transforms to become almost completely white or sandy blonde. This light color helps reflect radiant heat from the sun.

Addax OROA
Addax OROA

The species is also sexually dimorphic, meaning males and females look different in size. Males are larger, standing up to 120 cm at the shoulder and weighing up to 160 kg. Females are smaller, standing about 100 cm tall and weighing around 110 kg. Their faces are marked with brown or black patches that form an X over their noses.

Socially, addax live in herds containing anywhere from five to 20 members. These groups consist of both males and females and are usually led by one dominant male. While males are territorial and guard females, the females establish their own dominance hierarchies. In these female groups, the oldest individuals typically hold the highest rank.

Addax mit kalb
Addax mit kalb

The addax is not an aggressive animal, though it may charge if it feels disturbed. However, its slow movements make it an easy target for predators. These include lions, leopards, cheetahs, and African wild dogs. Even smaller animals like caracals, servals, and hyenas will attack addax calves.

Humans have interacted with the addax for thousands of years. Ancient Egyptian tomb pictures from 2500 BCE show addax being partially domesticated. In those societies, the number of addax a person captured indicated high social and economic status. Fossils of the species have been found at several sites in Egypt, including the Great Sand Sea, dating back to 7000 BCE. The animal was first described scientifically in 1816 by Henri Marie Ducrotay de Blainville. He based his description on a specimen found in William Bullock's *Pantherion*. The name "addax" likely comes from an Arabic word for a wild animal with crooked horns.

Today, the addax faces severe threats that have restricted its range. It was once abundant across the Sahelo-Saharan region, but it is now locally extinct in Algeria, Egypt, Libya, Sudan, and Western Sahara. The only known self-sustaining populations are found in Chad, Mauritania, and Niger.

Addax-Jerusalem-Biblical-Zoo-IZE-481b
Addax-Jerusalem-Biblical-Zoo-IZE-481b

Overhunting is a major cause of their decline, as their meat and leather are highly prized. They are also vulnerable to roadkill and habitat destruction caused by human settlements and agriculture. Chronic droughts in the desert further pressure the remaining population. Currently, it is estimated that fewer than 500 individuals exist in the wild.

Understanding the addax requires looking at its specific diet and reproductive cycle. They are primarily grazers, eating grasses like *Aristida*, *Panicum*, and *Stipagrostis*. They also eat the leaves of shrubs and leguminous herbs when necessary. To get protein, they rely heavily on seeds. The breeding season peaks in winter and early spring. A female's pregnancy, or gestation, lasts between 257 and 270 days. After birth, the calf is weighed and eventually weaned at 23 to 29 weeks old. This complex life cycle is a vital part of how the species persists in the desert.

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🖼️ Images & Media (5)
File:Addax - IZE-106w.jpg
Addax - IZE-106w.jpg
File:Addax-1-Zachi-Evenor.jpg
Addax-1-Zachi-Evenor.jpg
File:Addax mit kalb.jpg
Addax mit kalb.jpg
File:Addax-Jerusalem-Biblical-Zoo-IZE-481b.jpg
Addax-Jerusalem-Biblical-Zoo-IZE-481b.jpg
File:Addax OROA.jpg
Addax OROA.jpg
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