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- Unit description(src)
Drones stem from the savage gashyrr wasps of Eldersthine, absorbed into the Zerg Swarm to serve as resource gatherers. Over time they became drones, engineered with the larvae's ability to break down their own genetic coding and transform themselves into rudimentary zerg structures. A transforming drone needs creep to provide nourishment and mass to support its new form.
While the gashyrr wasps possessed the ability to fly, drones do not possess such an ability, the wasps' wings and legs becoming fleshy, webbed membranes that keep drones steady while in motion. Drones move by hovering above the ground using a float bladder (factoring this in, a drone stands nearly as tall as a terran wearing CMC armor). This peculiar organ emits a low-frequency energy field that disrupts gravity around the drone. The creature then "swims" through the air by undulating its body and using some of the excess energy as a means of propulsion. Dedicated analysis by Terran Dominion scientists has revealed that the aforementioned membrane is capable of expanding rapidly with a proper source of nourishment (e.g. creep). However, the gashyrr wasps' worker caste's ability to secrete compound B-5801 was maintained in a sense through genetic trimming and manipulation, allowing the drones themselves to become the biological focus of zerg structures.
Like the larva, drones are controlled by overlords who monitor their progress. Drones are usually single-minded about their tasks, diligently working through even raging combat. The drone's pincers are a minor evolution of those possessed by larvae, which gives them the ability to clamp and transport objects. The osseous tissue hardens through the pupation cycle, and its density allows drones to cut mineral crystals with ease, or defend themselves in a pinch.
Drones possess limited combat ability, but in a swarm, they can present a significant threat, attacking with claws and spines. 
- For StarCraft gameplay information see: Drone (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 drone was present in StarCraft: Ghost's single-player mode. Nova could mentally control a drone in order to "infest" a computer terminal, then use the terminal to control objects such as a robotic arm.
- For StarCraft II gameplay information see: Drone (StarCraft II).