What Really Killed Off the Woolly Mammoth?

What caused woolly mammoths to die-off so quickly? New evidence suggests an unfavorable climate may have contributed to a loss of grazing habitats, which eventually drove them to extinction.

from Videos | Smithsonian http://www.smithsonianmag.com/videos/category/science/what-really-killed-off-the-woolly-mammoth/
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