The addax (Addax nasomaculatus) is a medium‑sized antelope belonging to the family Bovidae, subfamily Antilopinae, and the sole species of the genus Addax. It inhabits the hyper‑arid Sahara and Sahelian regions of North Africa, ranging historically from Mauritania and Morocco eastward through Chad, Niger, Sudan, and into Egypt. Today, fragmented populations survive in protected areas of Niger, Chad, and Algeria. Adapted to extreme desert conditions, the addax possesses a pale, almost white coat that reflects sunlight, long slender legs, and distinctive twisted horns that can reach up to 150 cm in males. Its kidneys are highly efficient at conserving water, allowing it to survive weeks without drinking. The species is listed as Critically Endangered by the IUCN, with fewer than 1,000 individuals estimated in the wild. Conservation programs focus on anti‑poaching patrols, habitat restoration, and captive‑breeding reintroductions to bolster dwindling numbers.

Addaxes are primarily diurnal, seeking shade during the hottest part of the day and foraging in the cooler mornings and evenings. They form fluid herds of 10–30 individuals, typically composed of females, juveniles, and a few dominant males; bachelor groups may separate during the dry season. Herds exhibit seasonal migrations following the brief rains that stimulate fresh growth of grasses and shrubs. Territoriality is low; individuals mark paths with scent glands on the forehead and communicate through low‑frequency snorts, foot stamping, and occasional horn clashing during male contests. Social bonds are reinforced by mutual grooming and synchronized movement, which reduces predation risk from wolves and golden eagles.

The addax is a strict herbivore, feeding primarily on xerophytic grasses, leaves, and the tender shoots of desert shrubs such as Artemisia and Acacia species. During the brief rainy season, it consumes up to 2.5 kg of fresh forage per day, while in the dry season intake drops to 1 kg of dry, fibrous material. Water requirements are minimal; the animal extracts moisture from succulent plants and dew, allowing it to survive up to three weeks without free water. Feeding is selective; addaxes use their prehensile lips to pluck nutritious parts while avoiding thorny or highly fibrous sections. They also practice geophagy, ingesting mineral‑rich soil to supplement dietary sodium and calcium.

Sexual maturity is reached at about 2–3 years for females and 3–4 years for males. Breeding is closely tied to the short rainy season (typically June–August), when fresh vegetation is abundant. Mating displays involve males approaching females with head‑butting and horn‑clashing rituals. The gestation period lasts approximately 150 days, after which a single calf is born, weighing 5–7 kg. Newborns are precocial, standing within an hour and following the herd within a day. Lactation continues for 3–4 months, after which the calf begins grazing. Maternal care is intensive during the first weeks, with the herd providing protection against predators. Calves reach independence at about 8 months and are fully integrated into the herd by one year.

The addax is classified as Critically Endangered on the IUCN Red List, with an estimated wild population of fewer than 1,000 mature individuals. Primary threats include illegal hunting for meat and horns, which are prized in the illegal wildlife trade. Habitat degradation from expanding pastoralism, overgrazing by domestic livestock, and desertification reduces the availability of suitable foraging grounds. Competition with livestock for water and forage intensifies during droughts, while climate change exacerbates the frequency and severity of these droughts. Poaching, coupled with limited law‑enforcement capacity, has led to a 70 % decline over the past three decades. Conservation actions involve transboundary protected areas, community‑based anti‑poaching units, and captive‑breeding programs that have produced over 4,000 individuals, some of which are being reintroduced into the wild.

• The addax’s horns are the longest of any antelope, spiraling up to 150 cm.
• Its pale coat can appear almost bluish under the desert sky, providing camouflage.
• Addaxes can tolerate body temperatures up to 45 °C, a rare physiological adaptation.
• They are capable of traveling up to 80 km in a single night while searching for food.
• The species was once abundant across the Sahara, but now survives only in a few isolated pockets.