This story appears in the October 2018 issue of National Geographic magazine. Moon jellies, which are found in shallow bays around the world, look like small, not entirely friendly ghosts.

Freshwater jellyfish are growing in abundance in Canadian lakes and rivers. The reasons are complex but climate change is the primary culprit.

The sea is full of awesome creatures and many unsolved mysteries. Although it may be home to the answer of one of the ...

The National Oceanic and Atmospheric Administration (NOAA) spotted a surreal new species of jellyfish during an expedition to the "Enigma Seamount," a ridge in the Marianas Trench. The colorful ...

The jellyfish avoid the shaded lakeshore areas where their primary predators, anemones, live. The daily migration also benefits the lake, which once had an outlet to the sea but has been long ...

How many species of jellyfish are there? Jellyfish are sometimes called sea jellies. They belong to a group called Medusozoa which is divided into four classes: Hydrozoa, Scyphozoa, Cubozoa and ...