A potentially "immortal" jellyfish species that can age backward—the Benjamin Button of the deep—is silently invading the world's oceans, swarm by swarm, a recent study says.. Like the Brad ...

In other parts of the world, swarms of jellyfish have menaced swimmers and clogged fishing nets. In 2006, beaches in Italy and Spain were closed because of a bloom of jellyfish known as mauve ...

When we think of dangerous animals, a bag of water without a brain may not seem like it should be on the list. But if ocean bathers hear “jellyfish!” they’ll stand at attention like meerkats ...

Ocean plastic also smells appetizing to some marine critters. In 2016, a study in the journal Science Advances found that algae easily grows on ocean plastic, and as it breaks down, it emits an ...

Extremely rare phantom jellyfish caught on camera Fewer than 130 sightings have ever been made of the mysterious deep-sea creature. Now a 30-foot-long specimen has been spotted off Antarctica.

This jellyfish can sting at 5 million g—the fastest on Earth Animals sting for two pretty straightforward reasons: to defend themselves and to catch prey.

Even before dinosaurs, jellyfish were on Earth – and in its seas and oceans – for millennia, according to National Geographic. The gelatinous creature's body is comprised of more than 95% ...

These jellyfish can sting without touching you, thanks to 'mucus grenades' Cassiopea jellyfish make up for their lack of tentacles by releasing gooey clouds full of autopiloted stingers.

National Geographic's Pictures of the Year showcase "the wonder of our world in 29 pictures," and features work by photographers around the world. From a lion's mane jellyfish in the Arctic ...

Photographer Juan Antonio Martínez captured ethereal moments of the 2015 swarm, which first appeared in the Spanish edition of National Geographic magazine. Follow Wajeeha Malik on Twitter . Legal ...