fieldmuseum For #FossilFriday, take a quick look at horse…

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fieldmuseum For #FossilFriday, take a quick look at horse history 🐎
These 3 early horses on display in #EvolvingPlanet illustrate a general trend to longer legs with fewer toes. The earliest horses were small and had multiple toes. But as grasslands spread, longer legs with lighter, single-toed feet allowed horses to run faster and travel farther.
1. Hyracotherium, Paleocene (65-54.8 million years ago), Wyoming.
2. Mesohippus bairdii, Oligocene (33.7-23.8 million years ago), South Dakota.
3. Pliohippus, Micoene (23.8-5.3 million years ago), South Dakota.

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