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Thirty-five-year-old Daniel Botelho travels all over the world to photograph the wildlife of the sea, but found this man-of-war in the South Atlantic Ocean just outside his home in Rio de Janeiro, Brazil on July 31, 2016. The Atlantic Portuguese man o' war (Physalia physalis), also known as the man-of-war, blue bottle, or floating terror, is a marine hydrozoan of the family Physaliidae found in the Atlantic Ocean, as well as the Indian and Pacific Oceans. Its venomous tentacles can deliver a painful (and sometimes fatal) sting. Despite its outward appearance, the Portuguese man o' war is not a jellyfish but a siphonophore, which, unlike jellyfish, is not actually a single multicellular organism, but a colonial organism made up of specialised individual animals called zooids or polyps. These zooids are attached to one another and physiologically integrated to the extent that they are unable to survive independently, and therefore have to function as if they were a so-called individual animal. (Photo by Daniel Botelho/Barcroft Images)
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