A box jellyfish was found Oct. 4 on the beach of Bald Head Island in North Carolina, officials said. Getty Images/iStockphoto A stinging creature with 24 eyes and tentacles washed up on a North ...

The tentacles of the Portuguese man o' war, (which is technically a siphonophore, a group related to jellyfish), contain harpoon-like cells called nematocysts that deliver painful doses of venom.

Highly venomous jellyfish have stung more than three thousand people on Australia's northeastern shores in just a few days, authorities said Monday, forcing the closure of several beaches. Bluebottle ...

While jellyfish stings are seldom life-threatening, they can be a very unpleasant experience. Stings can cause pain, swelling, and in rare cases, serious reactions like breathing trouble. Treat stings ...

If you’ve spotted a big, blue jellyfish on your beach walk recently, it likely wasn’t a jellyfish at all. Beachgoers around north Florida reported seeing Portuguese men o’ war washed up on the sand ...