Fossil sirenians, related to today's manatees, give scientists new look at ancient climate

What tales they tell of their former lives, these old bones of sirenians, relatives of today's dugongs and manatees. And now, geologists have found, they tell of the waters in which they swam. While researching the evolutionary ecology of ancient sirenians -- commonly known as sea cows -- scientists unexpectedly stumbled across data that could change the view of climate during the Eocene Epoch, some 50 million years ago.

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