Mature aliens have concentrated acid for blood and two mouths, one inside the other, with the inner mouth being the alien's tongue. The tongue can extend up to one foot from the alien's mouth and its strong driving force can easily puncture a human skull. The alien can be up to eight feet tall and is bi-pedal. Its entire maturation process takes only a few hours. Soldiers are quick and agile with great strength, making them difficult to kill. Like insects, Soldier aliens serve and protect their Queen, which is even larger and more dangerous. Soldier aliens will find and immobilize suitable hosts while Drone aliens will build and maintain the nest.