11/6/2013

Ancient global warming has been linked to smaller mammal size, researchers say. Scientists looked at tooth fossils of the first horse species, Sifrhippus, which was as large as a small dog. They found that around 53 million years ago, when temperatures increased 5 to 9 degrees Fahrenheit, the creatures shrank by 19%; during an earlier and longer warming event, they got smaller by about 30%.

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