From SC2Pod
Like the Larvae from which they hatch, Zerg Drones contain within them the genetic code required to morph into any of the large Zerg "buildings", which are actually living, immobile structures. They can only grow on areas where the Creep has established itself, as they require its nourishment and building material. The Drones also harvest any raw materials that are needed.
Lore
The savage Gashyrr Wasps of Eldersthine were initially inducted into the 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 the Creep to provide nourishment and mass to support its new form.
Like the Larvae, Drones are controlled by the Overlords who monitor their progress through a type of instinctive telepathy. Drones are also unusually single-minded about their tasks, diligently working even through raging combat.
Drones have shown the ability to burrow into the ground when under attack. This technique allows them to remain concealed from their enemies while regenerating or waiting for reinforcements to arrive.
Basic Mutation
Advanced Mutation
Weapons
Abilities
Upgrades
StarCraft 2
The Drone's StarCraft 2 model
The
Drone is back in the same role in StarCraft 2. It is the Zerg's basic worker unit, and can still harvest minerals, gas, and mutate into buildings. Resource gathering has changed somewhat, with improved AI and lower quantities gathered per trip.
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8 are carried per trip. 
8 are carried per trip from a geyser with a 
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