A North American Beaver (Castor canadensis). A baby Amazonian Manatee (Trichechus inunguis). Amazon River Dolphin (Inia geoffrensis) at Duisburg Zoo. Eurasian otter (Lutra lutra) in Southwold, Suffolk, England. A North American River Otter (Lontra canadensis) at the Oregon Zoo. Capybara (Hydrochoerus hydrochaeris) A Platypus (Ornithorhynchus anatinus) at the Sydney Aquarium.

A partially submerged hippopotamus (Hippopotamus amphibius) at the Memphis Zoo.

Groups

This list covers only mammals that live in freshwater. For a list of saltwater-living mammals, see Marine mammal.

• Order Sirenia: Sirenians
  • family Trichechidae: manatees (3 species, however, the West Indian manatee lives in saltwater)
    • Amazonian Manatee (Trichechus inunguis)
    • African Manatee (Trichechus senegalensis)
    • Dwarf Manatee (Trichechus "pygmaeus") (validity questionable)
• Order Cetacea: Cetaceans
  • Superfamily Platanistoidea
    • Family Platanistidae
      • Ganges and Indus River Dolphin, Platanista gangetica with two subspecies
      • Ganges River Dolphin (or Susu), Platanista gangetica gangetica
      • Indus River Dolphin (or Bhulan), Platanista gangetica minor
    • Family Iniidae
      • Amazon River Dolphin (or Boto), Inia geoffrensis
  • Family Lipotidae
    • Chinese River Dolphin (or Baiji), Lipotes vexillifer (functionally extinct, since December 2006)
  • Family Pontoporiidae
    • La Plata Dolphin (or Franciscana), Pontoporia blainvillei
• Order Carnivora
  • family Mustelidae
    • Genus Lutra
      • Eurasian otter (Lutra lutra)
      • Hairy-nosed otter (Lutra sumatrana)
    • Genus Hydrictis
      • Spotted-necked otter (Hydrictis maculicollis)
    • Genus Lutrogale
      • Smooth-coated otter (Lutrogale perspicillata)
    • Genus Lontra
      • North American River Otter (Lontra canadensis)
      • Southern river otter (Lontra provocax)
      • Neotropical river otter (Lontra longicaudis)
    • Genus Pteronura
      • Giant otter (Pteronura brasiliensis)
    • Genus Aonyx
      • African clawless otter (Aonyx capensis)
      • Oriental small-clawed otter (Aonyx cinerea)
  • family Phocidae
    • Genus Pusa
      • Baikal seal (Pusa sibirica)
      • Ladoga seal (Pusa hispida ladogensis)
      • Saimaa seal (Pusa hispida saimensis)
• Order Rodentia: Rodents
  • Suborder Hystricomorpha
    • Capybara (Hydrochoerus hydrochaeris)
  • Family Castoridae: Beavers
    • North American Beaver (Castor canadensis)
    • Eurasian beaver (Castor fiber)
  • Family Cricetidae
    • Muskrat (Ondatra zibethicus)
  • Family Myocastoridae
    • Coypu (Myocastor coypus)
  • Family Cricetidae
    • European Water Vole (Arvicola amphibius)
• Order Monotremata: Monotremes
  • Platypus (Ornithorhynchus anatinus)
• Order Artiodactyla: Even-toed ungulates
  • Family Hippopotamidae: Hippopotamuses
    • Hippopotamus (Hippopotamus amphibius)
    • Pygmy hippopotamus (Choeropsis liberiensis)
• Order Afrosoricida
  • Giant Otter Shrew (Potamogale velox)
• Order Soricomorpha
  • Russian Desman (Desmana moschata)
• Order Didelphimorphia: Opossums
  • Family Didelphidae: Opossums
    • Yapok (Chironectes minimus)

See also

• Aquatic animal
• List of semiaquatic organisms
• Marine mammal

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