Related Clues:
- Pack bearer
- Beast that bore Balaam
- Irritating sort
- Aphid, to a fruit tree
- Dennis the Menace, to Mr. Wilson
- Horse's wild cousin
- Subject of many a 59-Down photo
- Onager, e.g.
- One may be kicked for motivation
- Paragon of stubbornness
- Equine animal
- Mule's parent
- Pumpkinhead
- Mosquito or mole, e.g.
- Fly, perhaps