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Extinction of North America’s largest animals likely caused by ancient climate change
Louise Boyle
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The Independent launches Independent Climate
Ancient climate change was likely behind the extinction of North America’s largest pre-historic animals, according to new research.
Earlier studies have suggested that growing numbers of “big-game” hunting humans in the Americas some 14,000 years ago led to large mammals being wiped out.
But the new study, from the Max Planck “Extreme Events” research group in Jena, Germany, proposes that populations of megafauna fluctuated due to climate change. 
Around 13,000 years ago populations of creatures such as mammoths, massive ground-dwelling sloths, giant beavers, and a huge armadillo-like species called glyptodons began to drop off. By around 10,000 years ago these creatures, classed as megafauna because they weighed more than 44kg, had vanished.  ....

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