Mutated on top of a Vespene Geyser, allowing Drones to harvest Vespene Gas. Normally an Drone returns 8 gas for trip, but when the available stock of Vespene Gas is depleted the Drone returns 2 gas per trip.
Extractors are one of the few zerg structures that function indipendenly from Creep: they can be built at every vespene gas geyser and don't take damage if Creep is not present. This is important for gas steals.
Note that differently from BW, if the extractor morph is interrupted the drone does not automatically gain full health, but only benefits from the normal zerg regeneration, making it regain a maximum of about 9 HP if the extractor is cancelled in the last seconds.
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