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The Dugong: scuba diving on the seagrass. The dugong (Dugong dugon) is a medium-sized marine mammal. It is one of four living species of the order Sirenia, which also includes three species of manatees. It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century. The dugong is the only strictly herbivorous marine mammal. Produced by Massimo Verde, Videobubbles If you're new here consider subscribing You can join us on Facebook! Instagram @videobubbles web