The Onager ( Equus hemionus ) is a large mammal belonging to the Equidae family . It is native to the deserts of Syria , Iran , Pakistan , Kashmir , Israel and Palestine , and western China . The Onager ( Equus hemionus ) is a large member of the genus Equus of the family Equidae ( horse family ) native to the deserts of Syria , Iran , Pakistan , India , Israel and Tibet .