Endermite

Endermites are the smallest hostile mobs in Minecraft.

Spawning
They have a 5% chance to spawn when an ender pearl lands, and can be spawned with spawn eggs. They will also occasionally spawn when an enderman teleports.

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

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

Endermites can attack endermen when spawned with a spawn egg.

Endermites, being arthropods, are weak against weapons with the Bane of Arthropods enchantment.

Endermites take suffocation damage if standing on soul sand, because their height is less than that of a slab.

Endermites spawn two portal particles around them.

Endermen
Endermen attempt to kill endermites that spawn from ender pearls.

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