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Ancient Whale Fossil Helps Detail How the Mammals Took From Land to Sea
Smithsonian   11 December 2019   World  
Michael Nolan / robertharding via Getty Images
<p>Whales don&rsquo;t swim like fish do. Instead of moving their tales side-to-side like a shark or a sunfish, the marine mammals pump their tails up-and-down to propel themselves forward. But over 50 million years ago, the earliest whales had legs and could ...