Most sea slugs use their raspy tongues to feed on prey that is attached to the seafloor. Instead, Bathydevius caudactylus works a bit more like a Venus fly trap. It uses a cavernous hood to trap crustaceans. Some other unrelated deep-sea species–including some jellyfish, tunicates, and anemones–use this feeding strategy.

Scientists uncovered the "mystery mollusk," a strange glowing sea creature lurking in the ocean's midnight depths.