Rabbit

A Rabbit is a passive mob that was added in Update 0.13.0. They are small, harmless creatures that drop Raw Rabbit, Rabbit Hide, and Rabbit's Foot which can be used to brew a Potion of Leaping.

Spawn
Rabbits spawn in Forest, Desert Biomes, Savannas, and any type of Snow Biome. They spawn in groups of 3-4.

Behavior
Rabbits are passive mobs that hop around aimlessly, and will find and destroy any mature crops other than wheat, melons and pumpkins. They will follow the player if they hold Carrots, Golden Carrots, or Dandelions, and can be bred using them.

Rabbits will run away from the Player and Wild Wolves, and the latter will attempt to chase them down and kill them. Tamed Wolves, however will not do so unless the Rabbit has been hit first.

Trivia

 * There is a hostile version of Rabbits called the Killer Bunny.
 * However, it is unknown if it will be added to Minecraft Pocket Edition or not.
 * Rabbits' fur colour depends on the biome they are spawned in.
 * Rabbits are able to sprint as fast as the player when being chased or when hit.