Mooshroom

Mooshrooms are unique variations of cows.

Spawning
Mooshrooms can spawn on mycelium or grass blocks in mushroom island biomes in herds of 4 to 8, when the light level is 9 or higher. They do not naturally spawn in any other biome.

Baby mooshroom
If a pair of mooshrooms are given wheat, they will breed. A mooshroom cannot be bred with a cow, even one that used to be a mooshroom.

Feeding wheat to a baby mooshroom will speed up its growing time by 10% of the remaining time.

Baby mooshrooms do not have mushrooms on their backs, but they will appear once it is fully grown.

Drops
Mooshrooms drop 0–2 leather and 1–3 raw beef (1–3 steak if killed while on fire). Shearing one will drop 5 red mushrooms and turn the mooshroom into a normal cow, emitting an explosion particle. When you shear the mooshroom cow, the mushrooms can't grow back. Mooshrooms also drop 1–3 experience when killed by a player or tamed wolf.

Like other baby animals, killing a baby mooshroom yields no items, nor experience.

Besides giving milk, mooshrooms can be with bowls to give mushroom stew.

Behavior
Mooshrooms tend to walk around slowly and aimlessly, huffing and mooing occasionally. They will avoid danger such as cliffs, fire or lava, but will make no attempt to stay out of water.

A mooshroom will follow players holding wheat.

Mooshrooms are 1.4 blocks tall, and baby mooshrooms are 0.7 blocks tall.

Data values
Mooshrooms have entity data associated with them that contain various properties of the mob. Their entity ID is.

Video
Pleas note that In Minecraft wii u edition, baby mooshrooms can no longer be milked. They must be fully grown before you can milk them.

Trivia

 * The name "Mooshroom" is a portmanteau for "moo" (which itself is an onomatopoeia of a cow's sound) and "mushroom".
 * In Console Edition, mooshroms and cows have different spawn limits. This means if the player has reached their cow limit, they cannot shear a mooshroom, and will get a error message when trying.
 * Curiously, they do not have a brown mushroom variant. Though this variation has been added in many mods and addons, it has never been mentioned by Mojang.