Zergling

"It's a Zergling, Lester...smaller type of Zerg..."

- Sarge to Lester after hitting a Zergling with their jeep.

The Zergling is the basic Zerg warrior.

Overview
Zerglings were evolved from the Zz'gashi Dune Runner when the latter were assimilated into the Zerg Swarm. The Zergling may be a relatively recent addition to the swarm given that Zz'gash seems to be located close to the Koprulu Sector. 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. Zerglings are one meter tall and possess webbed feet.

Lone Zerglings serve as lone scouts, though may have a retinue of Hydralisks if they scout an exceedingly long distance away from a Hive Cluster. When they attack however, Zerglings move in large groups, ranging from a dozen to a hundred, often acting as 'meat shields' for more powerful Zerg strains.

Zerglings continued to evolve after the Brood War, gaining the ability to metamorphose into Banelings.

StarCraft
The Zergling is the weakest of the basic troops. However, this is compensated for by their low cost and the ease of assembling large numbers of them.

Upgrades

 * Burrow
 * Carapace
 * Melee Attacks
 * Metabolic Boost
 * Cost: 100 0 100
 * Upgraded at: Spawning Pool
 * Requires: none
 * Increases Zergling speed.
 * Adrenal Glands
 * Cost: 200 0 200
 * Upgraded at: Spawning Pool
 * Requires: Hive
 * Decreases cooldown time to 6.

StarCraft: Ghost
Zerglings in StarCraft: Ghost maintain their burrowing and health regeneration abilities. In addition, Zerglings gain a "bloodlust" ability, which increases their damage and possibly speed while Zerglings move in groups.

StarCraft II
Zerglings have evolved, affecting such things as their appearance. They have small wings but cannot use them to fly.

Abilities

 * Baneling Morph
 * Transform the Zergling into glowing a green creature called a "Baneling" with a low-damage suicide attack.

Special Zergling Stains

 * Devouring Ones
 * Devours Children
 * Meat Eater
 * Meserole the Marauder
 * Screamer
 * War Zergling

Appearance
The design of the Zergling varies from cinematics to in-game, and it changes again for its cameo in Warcraft III--this design is also used in StarCraft: Ghost. They also came in World of Warcraft, with another new design. This can often be attributed to and explained by the "natural" state of the Zerg. The creatures are ever evolving and changing due to assimilation of new species and traits that upgrade the zerglings effectiveness, and thus appearance.

In StarCraft, they are bipedal creatures with Velociraptor-like legs. They have three webbed toes on the end of each. Protruding from below their head are two arms ending in scythe-like claws. When zerglings stand still these scythes fold down against their stomachs. Zerglings run by hopping on all four lower limbs, and attack by extending their upper claws and slashing down, then quickly stabbing forward and slashing with the lower before the first motion ends. They can be upgraded to do this even faster, via adrenal glands. This design is based on the picture in the manual; in-game, they're slightly different (primarily in the upper claws).

In StarCraft's cinematics they look rather similar. However, they're much thinner, their head is more separate from the body, and they lack the upper arms. Their scythe-arms are more agile and do not tuck below the stomach, and they stand more upright. They hop the same way, and attack with quick alternating slashes from each claws. Their heads are more rounded in this form, and their chests are quite thin and have very visible ribcages; they somewhat resemble a hydralisk in this incarnation. Also, their rear legs have less joints, and simply go straight back then bend straight down when they stand still. They're more agile than the other forms, and have been seen rearing up and leaning to the side in order to dodge incoming fire. Despite having less pairs of weapons, these seem to be the most dangerous incarnation of the Zergling.

In Warcraft III, they look like dogs with chitinous silver armor on their backs. Scythes protrude diagonally about halfway between each set of limbs. Massive mandibles are found on their seemingly eyeless heads. They attack by slashing inward with their scissor-like claws.

In StarCraft: Ghost they look similar, but have sleeker armor, a more catlike form, and longer scythes. They attack with a 1-2 punch motion with their claws, and can also do a jumping double-slash. In World of Warcraft, they look much like in Warcraft III but are shorter, fatter, lack the spiked tail, are solid brown, and have wider mouths. They just look generally cartoony, befitting their status as non-combat vanity pets.

in StarCraft II, they have two large scythe-like arms and small insectoid wings protruding from their backs.