News From the Field
Evolution of Earliest Horses Driven by Climate Change
February 23, 2012
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When Sifrhippus, the earliest known horse, first appeared in the forests of North America more than 50 million years ago, it would not have been mistaken for a Clydesdale. It weighed in at around 12 pounds--and it was destined to get much smaller over the ensuing millennia.Full StorySource
University of Nebraska-Lincoln
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