About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet's species. Less than 5 percent of the animal species in the seas survived. On land ...
All That's Interesting on MSN1mon
11 Of Ancient Earth’s Most Unbelievable Prehistoric AnimalsPrehistoric animals once roamed — and ruled — planet Earth. Some of them, like the giant sloth or the woolly rhino, were ...
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