Endermite

The Endermite is the second smallest mob in Minecraft.

Spawning
Any ender pearl used has a 5% chance of spawning an endermite.

Drops
Endermites drop 3 experience when killed by a player or tamed wolf.

Behavior
Endermites will attack players within 16 blocks of them. They have the ability to call other endermites in the area upon being hit, allowing them to see the player through walls.

Endermites despawn within 2 minutes, regardless of the player's distance from the endermite, unless they are named with a name tag. If they are named, they will never despawn and last until they are killed.

Endermites will take damage if walking on soul sand, due to its short hitbox.

Endermen
Endermen will attempt to kill endermites, provided they were spawned from ender pearls and there is not a nearby player.