The invertebrate is so popular, there's an entire day dedicated to raising awareness about jellyfish on November 3, fittingly called World Jellyfish Day. In honor of the holiday, here are 25 ...

In recent decades jellyfish populations in some parts of the world have boomed ... walnuts eat as much as 10 times their body weight a day—and many fish became food for the jellies.

the jellies reverse course and return to the western shore to await the dawning of a new day. This remarkable migration pattern has a crucial consequence: The jellyfish avoid the shaded lakeshore ...

Hundreds of jellyfish threaten to shut down an Israeli power plant every summer. In recent years, several other power plants around the world have faced the same threat. More from Science Hundreds ...