Which species of the horse family has never been domesticated?

Never heard of this type of horse...amazed that throughout the years that it is still around and not domesticated.

new info for me.thanks

alaalias, Onagers are native to Asia, and zebras are native to Africa. They are related, but not closely. Zebras have not been domesticated either.

KK, to do what to a wild animal?

Are zebras related to them?