Return to the SeaReturn to the Sea portrays the life and evolutionary times of marine mammalsfrom 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 fascinating account of the origin of various marine mammal lineagessome extinct, others extant but threatenedis for the nonspecialist. Against a backdrop of geologic time and changing climates and geography, this volume takes
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