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Horse Fossil |
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| Modern horses evolved from small, doglike animals that first appeared 60 million years ago. Pictured here is the skeleton of Mesohippus, an ancestral horse that lived during the Oligocene Period (34 to 23 million years ago). | ||||||
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| Kevin Schafer/Corbis | ||||||
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| Appears in these articles: | ||||||
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| Horse; Oligocene Epoch | ||||||
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