Portrays the life and evolutionary times of marine mammals - from giant whales and sea cows that originated 55 million years ago to the deep diving elephant seals and clam-eating walruses of modern times. This title gives an account of the origin of various marine mammal lineages, some extinct,...
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Portrays the life and evolutionary times of marine mammals - from giant whales and sea cows that originated 55 million years ago to the deep diving elephant seals and clam-eating walruses of modern times. This title gives an account of the origin of various marine mammal lineages, some extinct, others extant but threatened.
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