Portuguese man o' war, Physalia physalis, washed ashore. Showing the resemblance of its float to an empty water plastic bottle; hence its common blue bottle name. Despite its appearance, the Portuguese man o' war is not a true jellyfish but a siphonophore, which is not actually a single multicellular organism (true jellyfish are single organisms), but a colonial organism made up of many specialized animals of the same species, called zooids or polyps. These polyps are attached to one another and