The Drivel are large aerial organisms that were indigenous to the planet of SR388. They had a preference of living in dark locations, where they flew back and forth through the air. When a treat or perhaps potential prey item approaches close enough, they will spit out a huge glob of strong liquid acid that quickly burns through even the strongest of metals. This acid has been adapted so that should it miss its target, it will burst and ricochet around the area, although how this is possible is unknown; it is assumed that this bounce ability is created through a mixing of organic polymer that does not (or does not quickly) dissolve in the acid. Adventurers with the right equipment should take heed that this acid is capable of being converted into energy capsules when on the fly.
As SR388 has been destroyed, the Drivel are now considered officially extinct.
- Metroid II: Return of Samus (First appearance)