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chiru, (Panthalops hodgsoni), a small, gregarious, graceful antelope-like mammal of the family Bovidae (order Artiodactyla) that lives on the high alpine steppes of the Tibetan Plateau. Males carry thin, long horns that curve slightly forward; females are hornless. On each side of the blunt muzzle are two small bulges that contain air sacs used in vocalization. Adult males stand about 83 cm (33 inches) at the shoulder and weigh about 40 kg (88 pounds); females...