A common close partnership which sees baby fish sheltering from predators among the poisonous tentacles of jellyfish will be harmed under predicted ocean acidification, a new University of Adelaide ...

The seasonal return of a poisonous, stingy jellyfish is here once again, potentially putting families vacationing on the Gulf Coast, from Texas to Florida, in danger. The Portuguese man o' war is a ...

Jellyfish are some of the oldest and strangest creatures on Earth, surviving for more than 500 million years despite lacking brains, bones, and almost every advantage most animals rely on. While many ...

Carybdea branchi, pictured here, is a relative of the Australian box jellyfish (Chironex fleckeri), which is considered the most venomous marine animal. (Image courtesy of Brent Viljoen) They may not ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A five-year-old boy stung by a deadly box jellyfish at a beach in ...

Add Yahoo as a preferred source to see more of our stories on Google. A jellyfish rests on the sand at Savannah Beach in Delaware. Jellyfish sightings have spiked along the U.S. Atlantic coast this ...

Add Yahoo as a preferred source to see more of our stories on Google. Many American waters hide venomous creatures like lionfish, stingrays, jellyfish, sea urchins, cone snails, fire coral, ...

If you thought a regular jellyfish sting was painful, you definitely wouldn’t want to feel what a Portuguese Man O War could do to you - and they’re plaguing spring break beaches. The huge creatures ...

Jellyfish could be much smarter than scientists previously thought, asserts a new study published in the journal Current Biology. Poisonous Caribbean box jellyfish can learn at a far more complex ...