Head

Mob heads are decorative blocks. There are five variants of mob heads: Skeleton, Wither Skeleton, zombie, human and Creeper. The Wither Skeleton variant is a rare drop from the respective mob, with the other heads only available in Creative mode.

Obtaining
The Wither skeleton skull is a rare drop of Wither skeletons, while the other heads are only available in Creative mode. Obtaining a human head with the same texture as a specific player's head requires mods or external tools, and is achieved by changing the NBT Tag of ExtraType to the player's username.

Usage
The main use of heads is for decoration. They can be oriented in 16 different directions on top of a block, and 4 directions on the sides of blocks, similar to signs. They cannot be placed on top of each other.

The player can also wear heads as disguise, similarly to pumpkins. This will only replace the first layer of the player's skin. If the player has a second layer over their head, it will still render over the head (this also applies to Zombie Pigmen wearing heads). They can also be used as a decorative disguise, using dyed leather armor. Occasionally, another mob may pick up a skull and wear it just as the player would. This is common when a wither skeleton drops a skull next to another mob in the Nether. The only mobs which can wear the heads are the Skeleton, Wither Skeleton, Zombie, and Zombie Pigmen. Other mobs can only wear heads when spawned using custom spawners via mods or third-party tools.

Heads are not able to be pushed by pistons, as they have tile entities.

Spawning a Wither
Wither skeleton skulls are essential for spawning a Wither. To do so, place 4 soul sand in a vertical T-shape, then place three wither skeleton skulls on top. The orientation of the skulls does not matter.

As a crafting ingredient
Heads are used in the crafting of Firework Stars. Firework Rockets crafted with said stars will have an explosion shaped like a Creeper face, regardless of which type of head was used.

Trivia

 * When breaking any head, the particle effect of breaking it is the same as soul sand.
 * The most possible reason is because they don't have their own terrain.png spot or Blocks file, so a texture that made sense was chosen.
 * All heads are the same size (even though Wither Skeletons have larger heads than the other represented mobs).
 * Heads are one of the few blocks that do not use terrain.png (13w01b and earlier) or Textures/Blocks (13w02a and later) and take their textures from other objects.
 * Heads will break upon contact with water and lava.
 * The "hat layer" is not represented on mob heads.
 * In demo mode after the demo period has ended, breaking a Wither Skeleton skull will cause it to reappear as a normal skeleton skull.
 * Although Mob heads do not protect the player, an enchanted Mob head, when worn, will apply the said effects to the player.
 * If one uses the /give command to obtain a Mob Head block, it will always be a Skeleton Skull.