- a near threatened wild ass, Equus hemionus, inhabiting southwestern Asia and formerly distributed also through the Middle East and eastern Asia: the onager is one of the fastest mammals, able to run, and sometimes exceed, 40 miles (64 km) per hour, and, unlike most donkeys and horses, it has never been domesticated.
- an ancient and medieval military catapult for throwing stones.
- a Persian variety of the wild ass, Equus hemionus
- an ancient war engine for hurling stones
