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Despite its appearance, the Portuguese man o' war is not a jellyfish but rather a siphonophore, which, unlike jellyfish, is not actually a single multi-cellular organism. A siphonophore is a colonial organism made up of specialized individual animals (of the same species) called zooids or polyps. These polyps are unable to survive independently, and therefore have to work together and function like an individual animal. It gets its name from the uppermost polyp, a gas-filled bladder, which sits above the water and somewhat resembles an old warship at full sail.
This is Atlantic Portuguese man o' war was spotted washed up on the beach on Kuanidup Island in the San Blas archipelago, Panama. While snorkeling offshore the island in the Caribbean Sea, other Portuguese man o' wars were spotted floating at the surface of the water, where they usually live. They prefer warm tropical or sub-tropical waters.