Magmoo

Magmoos are naturally spawning, peaceful mobs.

ABOUT THE MOB

When milked, Magmoos have the ability to produce Lava Buckets.

The Magmoo spawns naturally in the nether, exclusively in Crimson Forest Biomes.

Magmoos drop Spicy Steak upon death.

Magmoos have a total of 10 health points, or 5 hearts.

Magmoos are attracted to Crimson Fungus. They will follow players holding them, and be able breed when fed them.

Magmoos are peaceful mobs, and will never attack players or other mobs.

Magmoos take damage from water and rain.

Since Magmoos have the ability to produce an infinite amount of Lava Buckets, you can use this to have renewable fuel.
Magmoos will take damage from rain, so ensure that they are under cover, as they will die within seconds of rain starting up otherwise.
Magmoos are immune to damage from Fire or Lava.
It can be difficult to bring a Magmoo back home from the nether, so you can use Entry & Exit eggs to quickly transport them if you have a friend available.

Magmoos were the first custom mob to be created.
Magmoos suffered the same fate as pigs when they were first created. Upon the first test of them, their bodies were upright and they looked like Creepers.