First Horses Shrunk by Warming Climate

[Bok]

The first horses in North America would not have been able to hold their own in the Triple Crown . At just about 5.6 kilograms the Sifrhippus sandrae hoofed onto the scene some 56 million years ago about the size of a small dog.
[More] (http://www.scientificamerican.com/article.cfm?id=first-horses-shrunk-warming)

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