Friday, November 20, 2009

Extinction of giant mammals altered landscape
[ Thu, 19 Nov 2009 21:27:38 GMT ]

Before ancient megafauna went extinct, mastodons kept broad-leaved vegetation, such as black ash trees, in check.Researchers found that once emptied of a diversity of large animals equaling or surpassing that of Africa's Serengeti, the landscape completely changed.


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