Zerglings are one of the most common zerg units in StarCrafts and are seen in almost every episode featuring zerg. Much like in StarCraft, they usually attack in large numbers. Their fragility is extremely exaggerated, as zerglings are often killed in one hit, especially by hellbats or other anti-infantry units.
Appearance
Unlike the horrific appearance of zerglings in StarCraft, StarCrafts' zerglings are cartoonishly cute. They are team-colored with small metabolic boost wings and teeth. They almost always appear to be smiling.
Contrary to the bloodthirsty nature of zerglings in StarCraft,StarCrafts zerglings have personalities similar to that of playful puppies. However, they are still capable of attacking and killing enemies, as shown in The Bane. Zerglings attack enemies by pawing at them, jumping on them, licking them, or occassionally biting them.
Unlike StarCraft zerg, zerglings do not appear to have a hive mind, as evidenced by Nucleared, when one zergling stayed to play with the nuclear launch targeting laser while all the other zerg fled.
Patchling is a recurring zergling who debuted in Zerg BM. It chased Sgt. Patches into a bunker and ripped off the rear end of his suit. As such, Patchling can be seen repeatedly coughing out scraps of blue fabric throughout several episodes.
Zerglings can sleep and lick their back, and can do spinning dance when they are idle or the player types "dance" command. When they attack, they can either bite or lick any target.
Trivia
A StarCrafts zergling portrait is a reward in StarCraft II for reaching zerg level 30.
On April 1, 2016, the April Fools Day, Blizzard announced a preview of StarCraft II: Legacy of the Void Co-op mission commander, CarBot Zergling. It appears as a 3D-modeled StarCrafts zergling.
When it was publicly revealed, the zergling commander was given generally positive reactions from StarCraft II players who watch StarCrafts.
