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1. Order Sirenia: the manatee, dugong, and sea cow
2. Order Carnivora, family Ursidae: the Polar Bear
3. Order Carnivora, infrafamily Pinnipedia: the seal, sea lion, and Walrus
4. Order Carnivora, family Mustelidae: the otterAmblonyx Aonyx Enhydra Lontra Lutra Lutrogale Pteronura Otters are aquatic or marine carnivorous mammals, members of the large and diverse family, Mustelidae, which also includes weasels, polecats, badgers and others. There are 13 species of otter in 7 ge
5. Order CetaceaMysticeti Odontoceti see text The order Cetacea includes whales, dolphins and porpoises. Cetus is Latin and is used in biological names to mean "whale"; its original meaning, "large sea animal," was more general, It comes from Greek ketos (" sea monster"): the whaleWhales are the largest species of exclusively aquatic placental mammals, dfsgRSFNjg A complete up-to-date taxonomical listing of all cetacean species, including all whales is maintained at the Cetacea article. Anatomy Like all mammals, whales breathe air, dolphinThis article is about the dolphin mammal. For other uses of the term, please see dolphin (disambiguation). See article below. Dolphins are certain aquatic mammals related to whales and porpoises. The word is used in a few different ways. It can mean: #any, and porpoiseNeophocaena Phocoena Harbor porpoises Phocoenoides Dall's porpoises The porpoises are small cetaceans of the family Phocoenidae they are related to whales and dolphins. They are however distinct from dolphins, although the word "porpoise" is often used to

Mammals evolved on land, and their spines are optimized for running on all four legs, allowing for up and down but only little sideways motion. Marine mammals therefore typically swim by moving their spine up and down, while fish normally swim by moving their spine sideways.

All mammals have hairHair is also a musical: see Hair (musical) and Hair (movie Hair is the filamentous outgrowth of the epidermis found in mammals. Hair is a characteristic of all mammals, though in some species hair is absent at certain stages of life. Hairs" are also found. The marine mammals, with the exception of polar bears and otters, have lost most of their hair, thus decreasing water resistance. They rely on insulation by a layer of fat instead. Since the different groups of marine mammals originate from different ancestors, this is a case of convergent evolutionConvergent evolution is an evolutionary process in which organisms not closely related independently acquire some characteristic or characteristics in common. This usually reflects similar responses to similar environmental conditions. Structures that are.

Note that the Polar Bear spends a large proportion of its time in a marine environment, albeit a frozen one. When it does swim in the open sea; it is extremely proficient and can cover up to 60km in a day. For this reasons, scientist regard it as a marine mammal.