Zebra Donkey, or "Zonkey" as it is sometimes called, is the last unlockable mount in Red Dead Redemptionmultiplayer. It is not available in the single player game.
The Zebra Donkey is the second fastest mount you can unlock, after the American Standardbred, though it has FAR more stamina. The Zebra Donkey cannot jump, but being off road does not affect its speed, technically making it the fastest overall mount in the game.
The Zebra Donkey mount is unlocked in multiplayer when the player has become a legend four times and has reached level 50 five times. See Ranks for more information.
The Zebra Donkey is fashioned after an oddity in Mexico, known as a Tijuana Zebra. It is a normal white donkey, painted (usually with shoe polish) to look like a zebra, and used in photos with tourists.
Interestingly enough, even though the Zebra Donkey is supposedly just a white donkey with shoe polish stripes, it is the best multiplayer mount while El Señor is the worst.
Zebra Donkeys are less likely to slow down when nearing a large drop, making for good times running them off a tall bridge.
The Zebra Donkey may also be a reference to the 'zebra taxi cabs' in the Grand Theft Auto series. These were unlocked upon significant completion of the "Taxi Driver" side-missions in GTA:Vice City, with superior performance levels in comparison to similar vehicles.
The Zebra Donkey is the only mount that, when locked, still has a visible mane color.