Endermite

Endermites are the smallest hostile mobs in Minecraft.

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

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

Behavior
Their movement and appearance is almost identical to that of a Silverfish. They will not enter blocks.

Endermites will attack players within 16 blocks of them.

Endermites despawn within 2 minutes, regardless of the player's distance from the endermite, except for when they have been named with a name tag.

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

Endermites will spawn two portal particles around them.

If a mob attacks an endermite, any endermites in the area will become hostile towards that mob.

Endermen
Endermen will attempt to kill endermites, provided they were spawned from ender pearls and there is no nearby player in Survival or Adventure mode. If the player is close enough to an endermite, endermen focus on the player instead of the endermite.

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