Equidae

Equidae: the scientific term for the horse family.  Equidae is a taxonomic family containing horses and related animals.  All the related animals are extinct, except those in the family Equus.  The Equus family includes horses, zebras, donkeys, and onagers.  Not sure...

Onager

Onager: the wild donkey of Asia.  From Greek όνος (donkey, ass) and άγριος (wild).   Άγριος derives from ἀγρός (field). Onager is also the name for a Roman siege weapon, a type of ballista, which threw stones from a bag or wooden bucket.  Evidently, this weapon had...