noun
a type of animal that lives in the ocean and breathes air, such as dolphins, whales, and seals
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Marine mammals, such as dolphins and whales, are highly intelligent creatures that inhabit the world's oceans.
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I love watching marine mammals like seals and sea otters play in the water at the aquarium.
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Check out that sick marine mammal show at the marine park!
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She's like a marine mammal in the way she gracefully navigates through difficult situations.