Side Effects: Sifrhippus, the First Horse, Got Even Tinier as the Planet Heated Up

[unable to retrieve full-text content]Sifrhippus, which lived 56 million years ago, shrank from about 12 pounds to about eight and a half pounds as the climate warmed over thousands of years, researchers report.

Source: http://feeds.nytimes.com/click.phdo?i=eeb457cd40bef9c54354280b3981639f

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