Donkey

Donkeys are passive mobs that were introduced to Minecraft in Update 1.6. Donkeys can be spawned with a Spawn Egg and are tamable. In survival they can be found naturally in the plains biomes along with their horse counter-parts. They are one of four different possible mounts in the game as of 1.6.2. The other three being Horses, Pigs, and Mules.