The bat volute (Cymbiola vespertilio) is a large predatory sea snail found in the Central Indo-Pacific, with shells ranging from 1.75 to 6.25 inches in size. Its shells, which are highly sought after by collectors, have variable patterns and colourations depending on the region. They are benthic, living on the seabed at depths of up to 20 meters, and are an important food source for some local communities, though their toxicity is not well-understood.