Zerglings form the most numerous of the zerg mutations; the simple DNA allows two zerglings to be spawned from a single larva. The larvae get the genetic information from the "primordial ooze" of spawning pools. As the smallest zerg strain apart from the larvae, zerglings are one meter tall and possess webbed feet. Further mutations may be made to zergling DNA, namely the alteration of their physiology through a metabolic boost to increase their reflexes and rate of movement and the mutation of their adrenal glands, changing their glandular balance to induce a battle frenzy.