A researcher is trying to solve a marine mystery in the waters off Cape Cod — why a particular jellyfish, not known for stinging people, has been stinging swimmers in recent years. Using protective ...

A mystery giant jellyfish that washed up on an Oregon beach may turn out to be a more grisly discovery than previously thought. Portland woman Pilar French had been walking on Cannon Beach with her ...

A jellyfish species not known for stinging humans has been doing just that on Cape Cod, and researchers aren’t quite sure why. The moon jellyfish is “typically harmless,” but in the last two decades, ...

Three Cassiopea, or upside-down jellyfish, from Bonaire, Dutch Caribbean seen from above in the lab at the Department of Invertebrate Zoology in the Smithsonian’s National Museum of Natural History.