When they unfold and get out in the open, they are formidable animals indeed: (a diver gets acquainted with one old and wise specimen in the Japan Sea, Primorie, Russia - a Giant Pacific Octopus Doflein).
Related to the jellyfish and corals, Siphonophore is a continuous chain of specialized polyps - individual animals that grow from one another in an organized colony. Some in the colony are devoted to feeding, armed with stinging cells to snag fish or in
rhamphotheca: “ Monogamous Animals: Sea Horses Scientists have studied only a handful of species of seahorses (genus Hippocampus), but all of them appear to practice some form of monogamy. After her eggs are fertilized, a female seahorse passes them.