Aquatic and semiaquatic mammals are a diverse group of mammals that dwell partly or entirely in bodies of water. They include the various marine mammals who dwell in oceans, as well as various freshwater species, such as the platypus and the European otter.
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1. whales and dolphins; manatees and dugongs; walruses; seals
(hypernym) placental, placental mammal, eutherian, eutherian mammal
(hyponym) cetacean, cetacean mammal, blower
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