The big, blue jellyfish washing up on Florida beaches this week actually aren't jellyfish at all. Here's what to know about ...

Learn how the air-filled pneumatophore helps the Portuguese Man o’ War float and why it often ends up stranded on beaches.

Anyone unfamiliar with the biology of the venomous Portuguese man-of-war would likely mistake it for a jellyfish. Not only is it not a jellyfish, it's not even an "it," but a "they." The ...

With the weather turning warmer, people visiting beaches in Galveston and other spots along the Texas coast are reporting more Portuguese man-of-war sightings. The species may look pretty and ...

The Portuguese man-of-war is not a jellyfish, but is closely related. The name comes from its resemblance to an 18th-century Portuguese warship at full sail, according to the NOAA website.

Portuguese man o' war, often mistaken for jellyfish, have been sighted on Florida beaches. While rarely fatal to humans, the sting can be intense and should be treated with hot compresses ...