"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 ...

Add Popular Science (opens in a new tab) More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results.

Water covers more than 70% of the Earth’s surface, offering diverse habitats for countless species, including marine mammals. Some mammals have uniquely adapted to aquatic life, evolving specialised ...