Zombie Pigman

Zombie Pigmen are hostile mobs which were implemented in 0.5.0. They currently only spawn from the Nether Reactor in waves of 2-3. However they spawn naturally in the Nether now as of Update 0.12.1.

Attack
Zombie Pigmen wield a Gold Sword that can deal about 2 1/2 hearts of damage per hit. They are slightly faster than the other hostile mobs, making them superior to all Mobs except Creepers.

Zombie Pigmen are pack mobs, meaning if one is attacked, all others will also attack the player.

Combat
It is best to fight with zombie pigmen using a Bow, though an Iron Sword or a Diamond Sword will also suffice.

Flint and Steel and Lava are not effective as they are immune to fire.

Baby Variant
Baby Zombie Pigmen were added in Update 0.11.0. They are much faster and can fit through smaller places.

Trivia

 * Zombie Pigmen drop Gold Ingots and Feathers, unlike other versions of Minecraft, in which Zombie Pigmen drop Gold Nuggets and Rotten Flesh.
 * Now in, 0.12.1, they drop Golden Nuggets.
 * They can also rarely drop a Gold Sword.
 * After Update 0.12.1, zombie pigmen will become neutral mobs.
 * Occasionally, Zombie Pigmen drop carrots and potatoes.