Mooshroom

Mooshrooms are unique variations of cows.

Spawning
Mooshrooms are 1.3 blocks tall (1.4 blocks tall in 1.9)

Baby mooshrooms are 0.65 blocks tall(0.7 blocks tall in 1.9)

Mooshrooms spawn on mycelium blocks in mushroom island biomes in herds of 4 to 8.

Baby mooshroom
If a pair of mooshrooms are given wheat, they will breed.

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

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.

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

Behavior
Mooshrooms tend to walk around slowly and aimlessly, breathing and mooing occasionally. They also tend to jump off high cliffs and make no attempt to stay out of water. During a rain or thunderstorm, mooshrooms can be seen taking cover under structures or trees to avoid getting wet.

A mooshroom will follow players holding wheat, and in doing so may run off cliffs and into damaging blocks.

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

Trivia

 * The name "Mooshroom" is a portmanteau for "moo" (which itself is an onomatopoeia of a cow's sound) and "mushroom".