Man may have caused prehistoric extinction

U.S. and British scientists say they've determined prehistoric horses in Alaska may have become extinct due to hunting by man, rather than climate change.

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<p><a href="http://www.physorg.com/news66040055.html">Man may have caused prehistoric extinction</a></p> <p>U.S. and British scientists say they've determined prehistoric horses in Alaska may have become extinct due to hunting by man, rather than climate change. </p>