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addax, (Addax nasomaculatus), the most desert-adapted African antelope, formerly found throughout most of the Sahara but nearly exterminated in the wild in the last quarter of the 20th century by poaching from motorized vehicles. The addax’s most striking feature is its long spiral horns. Male addaxes weigh 100–135 kg (220–300 pounds) and have a shoulder height of 95–115 cm (37–45 inches). Their horns are 76–109 cm (30–43 inches) long. Females are nearly as tall as...