Contact: Lee Siegel
University of Utah
Caption: The chewing surface of a fossilized upper molar from an equid -- an ancestor of zebras -- that lived in East Africa 9.6 million years ago. University of Utah researchers studied 452 fossil teeth from nine families of animals to show that between 10 million and 3 million years ago, different East African plant eaters changed at different times from a diet of trees and shrubs to a diet of warm-season grasses.
Credit: Kevin Uno, University of Utah
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