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Mammals evolved on land, and most still live on land. However, there are still a number that live exclusively in the water (such as whales, dolphins, manatees, etc) and many more that spend much of their time in water (such as beavers, seals, platypus, etc). One thing to note about aquatic mammals is they cannot get oxygen from water like fish, so they have to surface to breathe air frequently.

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10y ago

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