Portuguese Man-of-War

Not a jellyfish but a floating colony with a devastating sting/Deep Sea & Ocean Life

The Portuguese man-of-war (Physalia physalis) is not a single animal but a colonial organism made up of specialized polyps working together. Its gas-filled float (pneumatophore) is about 30 centimeters long and sits above the waterline like a small sail, while its tentacles trail up to 30 meters below the surface. Each tentacle is covered in nematocysts that deliver an intensely painful venom capable of killing small fish instantly and occasionally causing fatal reactions in humans. Even dead specimens washed up on beaches can still sting, making them the gift that keeps on giving.