Scientists have found that a species of the jellyfish throw venom grenades to create stinging water to snare their preys. The Cassiopea xamachana jellyfish, found in shallow waters around Florida, the Caribbean and Micronesia, is a frequent nuisance to snorkelers and surfers who appear to get stung without touching the creatures. It was thought that the stings came from detached tentacles or younger specimens. But a team from the U.S. Naval Research Laboratory realized that Cassiopea had in fact evolved a novel way of hunting without tentacles.
Jellyfish Expert: Biodiversity & Genomics