Monster Spawner

Mob Spawners are blocks with a transparent blue lattice structure found in dungeons. Flames (representing the magic that is creating the mobs Notch has said) can be seen within the block as well as a miniature hostile mob spinning around inside. The miniature mob inside the mob spawner continues to spin faster until a mob of the type shown is spawned in an area around the spawner. Mobs will continue to be spawned from the block indefinitely and this has been abused by many players by creating a deep hole below the spawner or implementing some other type of mob farming device.

The spawner cannot be removed and collected with a pickaxe. However, upon replacing the block it will only spawn pigs. On peaceful difficulty, mob spawners will naturally spawn hostile mobs but they are despawned immediately. Mob spawners do not spawn Sheep or Creepers; they do spawn Pigs, Spiders, Zombies, and Skeletons.