A warm snap more than 50 million years ago caused ancestors of modern-day horses to shrink, finds research.
via Discovery News http://news.discovery.com/animals/mini-mammals-ancient-warming-pared-body-size-131105.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/animals/mini-mammals-ancient-warming-pared-body-size-131105.htm#mkcpgn=rssnws1
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