There’s evidence to suggest that the comb jellyfish was the first animal to appear on Earth some 700 million years ago.

Instead, when a box jellyfish stings, it releases a "digestive cocktail" that helps the creature catch and digest its meals.

Anyone unfamiliar with the biology of the venomous Portuguese man-of-war would likely mistake it for a jellyfish ... fish and other small creatures. For humans, a man-of-war sting is ...

While some jellyfish species seem to thrive on human disturbance—off the coast of Namibia, for example, overfishing may have tipped the ecosystem into a new state dominated by compass and ...

The jellyfish also must have perfect conditions where they aren't going to be harmed by anything external, such as by humans or other predators.' T. dohrnii is sensitive, making it also difficult to ...

But not all jellyfish sting and some jellyfish stings aren’t harmful to humans. Some creatures take advantage of jellyfishes’ stings to protect themselves from predators. So-called ‘Medusa’ fish hang ...