"Return to the Sea 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 ...
Although an extinct animal was from a different group of marine mammals, an examination of fossils showed it evolved a way of eating that was very similar to that of modern walruses. By Asher Elbein ...
Scientists have discovered a 246 million-year-old marine reptile fossil, the oldest of its kind to be found in the Southern Hemisphere, shining a new light on the early evolution of marine mammals.
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