These gelatinous orbs, no larger than a quarter, feature a striking blue or green rim and a translucent disk that floats ...

Jellyfish are causing pain for beachgoers from Maine to Florida. Warming waters and human activity have helped boost jellyfish populations.

Jellyfish are showing up in unexpected waters. What's going on? With a baking hot summer predicted, Americans will flood to the beach. They’ll face jellyfish encounters.

Large groups of moon jellyfish are stinging swimmers off Cape Cod. The jellyfish are typically harmless to humans. Genetic analysis suggests a new subspecies or an existing, invasive species ...

An unusual jellyfish species found in the eastern Pacific Ocean called Cladonema pacificum is only about the size of a pinkie nail, but it can regenerate an amputated tentacle in just two or three ...