The beautiful purple shell of the violet sea snail (Janthina janthina) is only part of what makes this gastropod so interesting. Otherwise known as the bubble-raft snail, the critter collects bubbles in its mucus, then uses its bubbly concoction as a raft for long-distance ocean travel. Floating is their only means of transportation as they cannot swim. They can be found in warm tropical and temperate waters worldwide but high concentrations of them occur in the subtropical Atlantic, Indian, and Pacific oceans. (bubble raft pictured below)