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Drones are easily identified by their smooth head carapaces, among the smoothest of all Xenomorphs, and they are capable of spitting cysts of acidic blood at their enemies.[2] They average around 8 feet tall when standing on hind legs, and about 14–15 feet long, tail included.
The Drone first appears in Alien, and as such was the first Xenomorph designed and seen. Drones were also supposed to appear in Aliens, but during pre-production the creature's smooth carapace was removed out of fear the fragile dome would crack during filming, a modification that gave rise to the Warrior caste.