Portuguese man-of-war

The Portuguese man o' war (Physalia physalis), also known as the Portuguese man-of-war, man-of-war, or bluebottle is a marine cnidarian of the family Physaliidae. Its venomous tentacles can deliver a painful sting.

Despite its outward appearance, the Portuguese man o' war is not a common jellyfish but a siphonophore, which is not actually a single multicellular organism, but a colony of specialized minute individuals called zooids. These zooids are attached to one another and physiologically integrated to the extent that they are incapable of independent survival.

For more detailed information see Portuguese man o' war.