Call it an unfinished story, but with a plot that's a grabber. It's the tale of an ancient land mammal making its way back to the sea, becoming the forerunner of today's whales. In doing so, it lost ...

The story of whales did not begin in the seas. For millions of years before beasts like the sinuous Basilosaurus lived full time in the ocean, the shorelines and estuaries of prehistoric Earth were ...