Zombie Horse

Zombie horses are unused mobs.

Spawning
Zombie horses do not spawn naturally, but may be created by the command or with their spawn egg.

Appearance

 * Zombie Horses appear to be the horse equivalent of zombies. Like zombies, zombie horses are green-skinned, and their eyes are completely black. They are also passive. They are also the only horse type that is considered unused.  They can only be summoned via command line or spawn from a spawn egg in creative mode.

Drops
Zombie horses drop 0-2 rotten flesh.

Usage
Tamed and saddled zombie horses can be used as means of transportation in the game, though they are unable to fit through single block-wide openings. They can also be used to climb hills. They can be ridden in water. Zombie Horses      can be ridden while submerged underwater.

Equipment
Zombie horses have a line equipment slot.


 * Saddle Slot: For equipping a saddle.

Riding
Once a horse is tamed and saddled, the player can control it with standard directional controls,, and the mouse. The player dismounts using the control.

Zombie horses are spawned already tame.

When riding a horse, the hunger bar is replaced by the horse's health in survival or adventure mode. In the Legacy Console Edition, the horse health bar will still be visible on creative. It uses a slightly different heart texture than the player's health bar. The experience bar is replaced by the horse jump bar.

A player can use any item while riding a horse, including drinking or throwing potions; activating doors or redstone devices; using chests, crafting tables, and furnaces; breaking and placing blocks; and attacking with melee weapons or bows.

A ridden horse will automatically run up any one block high slope. The horse and rider can safely fit through a space as low as 2.75 blocks high. Lower clearance risks suffocating the rider if the rider's head enters a non-transparent block. The horse itself can enter gaps as low as 1.625 blocks high, but may itself take suffocation damage when clearance is less than 1.75 blocks. Horses cannot fit through a 1-block-wide gap.

It is impossible for a player to use a Nether portal while on a horse. It is possible however, to enter the portal on the horse and then dismount, sending the horse through the portal on its own, or use a lead to position the horse, then push it through the portal.

Behavior
Zombie horses will roam idly, occasionally stopping to rear, swish their tails, or lower their heads as though eating the grass. Unlike sheep, the eating animation does not actually cause any grass to be consumed. If a player comes near, the horses may turn to look at them.

They will also make noises.

Zombie horses, like most mobs, can ride in a minecart and boat. Unlike other passive mobs, these will slowly regenerate health.

Taming
Zombie horses spawn tame.

Statistics
Zombie horses are spawned with constant health of 15, speed of 0.2, and have a jump strength which ranges from 0.4–1.0, tending towards the average 0.7.

Data values
Zombie horses have entity data associated with them that contain various properties of the mob. Their entity ID is.

History
There's a lot of history to dig through; I'll fill some of it in