04/02/2026
THE WEIRDEST THING IN THE OCEAN
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The weirdest but also beautiful & fascinating:
Portuguese Man of War/// Caravela Portuguesa/// Żeglarz Portugalski (bąbelnica bąbelcowa, żywłoga, aretuza) /// Physalia physalis
50x70 cm, oil on canvas, 2026
The Portuguese man o' war, also known as the man-of-war or bluebottle, is a marine hydrozoan found in the oceans.
Although it superficially resembles a jellyfish, the Portuguese man o' war is in fact a siphonophore. Like all siphonophores, it is a colonial organism, made up of many smaller units called zooids. Although they are morphologically quite different, all of the zooids in a single specimen are genetically identical. These different types of zooids fulfill specialized functions, such as hunting, digestion, and reproduction, and together they allow the colony to operate as a single individual.
The man o' war is part of the neuston, organisms that live on the surface of the water. A gas-filled bladder called the pneumatophore provides buoyancy that lets the animal stay afloat on the surface of the water while its tentacles, which can be up to 30 m (100 ft) long, hang below the surface, containing venomous cnidocytes that help capture prey. The cnidocytes can deliver a sting powerful enough to kill fish, crustaceans, and in some cases, humans. A sail on the pneumatophore propels it about the sea, sometimes in groups as large as 1,000 individuals. The sail may be left or right-handed, based on what direction the wind catches it.
The name “Portuguese Man o’ War” comes from the resemblance of this animal’s floating, sail-like bladder to the armed Portuguese warships (called caravels) used during the Age of Exploration in the 15th–16th centuries. Early sailors thought the blue, sail-shaped float looked like the small Portuguese warships at sea, so they named it after them.