The Larva (Plural: Larvae) is a Zerg unit that automatically spawns on average every 342 frames, directly below every Hatchery, Lair, and Hive, with a maximum of 3 Larvae at any one of these buildings. Unlike Protoss and Terran buildings, which may only build one unit at a time, Zerg buildings themselves do not build units but rather delegates this task to Larvae allowing units to be simultaneously built by utilizing multiple larvae. Another unique feature of larvae is that, given the necessary tech, it can morph into the majority of Zerg units, the exceptions are Guardians, Devourers, and Lurkers which must be morphed from Mutalisks and Hydralisks respectively, without the direct need for units to be built from different buildings.
Larva is relatively difficult to kill, because it has 25 hit points and 10 armor, and therefore is not a priority target when attacking an enemy base. Larva does not add to the supply count. When a Hatchery, Lair, or Hive morphs, one additional Larva instantly spawns. Although not ordered to do so, larva moves back and forth below its respective building which will cause melee units to take a slightly longer, but negligible amount of time to kill.
When ordered to morph into another unit, the larva becomes an Egg until the unit fully morphs. Canceling unit production will kill the Egg and does not refund a larva. Larvae die after the last creep-producing building (Hatchery, Sunken Colony, Spore Colony, or Creep Colony) has been destroyed and the creep under the larvae produced by these buildings disappear.
- It can be used to stack a Mutalisk group together.
- Moving the Larva closer to the Minerals with the Larva Trick, so when a Drone morphs, it has a shorter path.
- Moving the Larva to a position with the Larva Trick and morphing them into an Egg to block an narrow passage.
- Morphing into an Egg to push an unit away from the Hatchery.
- Vulture mines will attack larva and can kill them in one hit.
- A Science Vessel's Irradiate will not damage larva.
Due to the nature of larva dying when not on creep and the introduction of 3rd party map tile editors (and even just the edges of any map), Some hatchery placements cause the larva to spawn and die before they get a chance to be utilized.