User:Nickj

A Nickj (or nickjasaitis) is an extremely rare mob that has only spawned once, during the Minecraft Beta tests.

Drops
A nickj drops the following:

1-2 stacks of Dirt

Lots of Wood

Other items

Spawning
Nickj often spawns on peaceful,but can be found in all the other difficulty levels. Finding a nickj in hard is very rare. They prefer to spawn in a light source on the surface. They are the second mob to be able to pick up blocks. They often build large houses that are beautiful and efficient. NPC Villages are a good place to find one, in the houce with a large glass tree house outside.

Do not go searching for this mob on singleplayer mode
It only can be found on Multiplayer server, preferably with beautiful structures.

The following is for people who do not believe that this is not a real mob.
Now that I know you don't think that this is a real mob, you're right. That is the reason it only spawns on multiplayer.