Spawning Pool, Larva (unit)
Morph to Baneling - Turns the Zergling into the suicidal Baneling. Does splash damage.
Burrow - Allows unit to burrow underground.
We've all heard about the Zerg rush, and certainly the Zergling is a part of that strategic effort. Small and fast, yet light-armored and weak, the Zergling is the Zerg's standard, low cost flag bearing troop.