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- A mutalisk screams(src)
Mutalisks communicate in part through scent, by means of different musks derived from its biological processes. The gaseous by-product of these processes is stored in special sacs located throughout the creature’s body, where it can be reserved for spaceflight propulsion. To survive in deep space, the mutalisk became self-sufficient. Every cell in its body is host to myriad bacteria that either produce chemicals or assimilate them in order to generate compounds for sustenance. New mutalisk strains present certain genetic alterations to their cellular flora, resulting in more efficient bio-processes—to the point of tissue regenerating capabilities.
Mutalisks are carried aloft by leathery wings. These appendages afford the mutalisk an astonishing degree of speed and maneuverability during atmospheric flight. Wing motion also generates energy that serves as a catalyst for the creature’s internal biological functions.
Like the mantis screamer, mutalisks can also travel through space, and the rigors of deep space travel are a natural part of a mutalisk's life. The skin of their annelid-like bodies takes on a gelatinous consistency and seeps through the dermal layer. This process compacts their organs and circulatory system to prevent damage from external pressure. It was unknown how mutalisks were able to travel through space initially, but it was recently revealed that mutalisks excrete a gas which they can use to propel themselves in space. Even when within a vaccuum, they never stop flapping their wings—Dominion scientists have determined that this is a leftover instinct and unrelated to locomotion. The gas itself is odorless.
Mutalisks are an infamous strain among terrans, known for their ability to shred through targets in a single attack. In battle, mutalisks form the primary flying forces of the zerg, making hit-and-run attacks against vulnerable installations and wheeling across the skies in prodigious numbers above zerg nests or land-based forces. Many attempted engagements with the zerg have collapsed due to the rapid arrival of large numbers of mutalisks before any meaningful air defense could be mustered. Under these circumstances the total loss of the forces involved is virtually guaranteed. Conversely, powerful air defenses have succeeded in keeping mutalisks at a distance, for the creatures are limited in vitality. However, they remain agile and dangerous opponents. In large numbers or against weak defenses, mutalisks will always be a deadly threat.
The mutalisk is not an especially intelligent creature and exercises little initiative, preferring to drift lazily through the air. Once engaged however, it demonstrates a blind bloodlust that makes it dangerous to all those around it, including itself. In addition, mutalisks are able to trace terran transmissions to their source.
The mutalisk spawns small, voracious creatures called "glaive wurms", or "glave wurms", and projects these creatures to attack. Glaive wurms fly between multiple targets as they degrade explosively. The mutalisk's reproductive system—its ovipositor—has been adapted into a weapon delivery system.
A mutalisk's fangs are also deadly and given that mutalisk blood is acidic, able to melt through even CMC armor, such close quarters are hardly favorable to a mutalisk's intended victim(s). This being said, the mutalisk is not without its vulnerabilities. Its own acidic blood is injurious to itself and its wings are exceptionally fragile, able to be shredded even by glass. As such, it is a viable tactic for terrans to aim for the wings when trying to down a mutalisk.
The acidic blood frustrates Dominion scientists, as it has made it difficult to dissect a corpse.
Mutalisks have a minor resistance to their acidic blood, but few live long enough to develop a greater resistance due to their lack of self-preservation instinct. On very rare occasions, less than one in a million, a "Big Fish" or "Canny Mutalisk" will develop immunity. The Terran Dominion Special Research Ops sought such a mutalisk, as they would finally be able to dissect one. Eventually, one such mutalisk was captured on Choss. The corpse was transported in a coldbox to Project Blackstone.
- For StarCraft gameplay information see: Mutalisk (StarCraft).
This article or section contains information about StarCraft: Ghost, which has been declared non-canon. Elements may be taken as 'flavor lore' however.
The mutalisk cannot regenerate like most other zerg units; instead, it can abduct land-bound terran units, draining their life (which restores the mutalisk's health). The mutalisk's attack is a powerful bio-plasma attack that does splash damage; the attack becomes more powerful if charged.
The mutalisk is the most expensive zerg unit in the Invasion Mode, costing five points.
- For StarCraft II gameplay information see: Mutalisk (StarCraft II).
Heroes of the StormEdit
In the current Beta, Zagara can choose to amplify an ability to spawn mutalisks. 
Special Mutalisk StrainsEdit
- Evolved Mutalisk
- Fiend (cut content)
- Fury (cut content)
- Primal mutalisk
- Lilev (cut content)
- Zergrinch Drake