Jellyfish hurl venom 'grenades' to snare prey

A species of jellyfish hunts its prey by hurling venom grenades to create "stinging water", researchers said Thursday, solving a long-standing mystery as to how they gather food without tentacles. 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.