Zombified Piglin

Zombie Pigmen are neutral mobs that first appeared in Minecraft alpha. Zombie Pigmen drop cooked porkchops when killed, and therefore are a renewable source of food in the Nether.

Behavior
Zombie Pigmen wander around aimlessly, avoiding cliffs, Ghasts and lava. If you stand near a Zombie Pigman, it will turn its head towards you for a few seconds, then resume its wandering. Zombie Pigmen spawn in packs of 4-10 and tend to stay together. It seems, however, if space is limited (for example, a narrow tunnel), they may spawn in smaller groups or even alone. Attacking one Zombie Pigman will cause the entire group to become hostile, often swarming the player. If the player moves a certain distance from a pack, waits a while or leaves the nether and returns; they will become neutral again. Switching the difficulty to Peaceful will also make the group become neutral again.

Trivia

 * Zombie Pigmen are supposed to be immune to lava and fire, but if they are in lava for long enough, they will be damaged.
 * Despite wielding a golden sword, they deal 3 (Normal Mode) damage instead of the normal 2 damage.
 * Zombie Pigmen, prior to the 10th of November 2010 update, would never forgive the player for attacking them. Now after a certain amount of time has passed since an attack, they will become neutral.
 * Zombie Pigmen cannot travel to the Overworld using Portals.
 * The skin file has "thx xaphobia" written on it, as a credit by Notch to the skin's original creator.
 * When spawned in the real world using outside mods or hacks, fire will appear on Zombie Pigmen at random times but quickly disappear.
 * Despite being immune to fire and lava, Zombie Pigmen, as well as Ghasts, are capable of drowning if under water or lava for too long.
 * The green liquid in the Zombie Pigman skin was originally blood red, but got changed due to users expressing a liking for the existing lack of blood anywhere of Minecraft.
 * Oddly enough, when the crosshairs are set on a zombie pigman, the inventory will turn transparent.

Drops

 * 0-2 Cooked Porkchops
 * Rumored to drop feathers like zombies