Because the predators were so large and fast, in order to have the ability to run away from them, the horses legs grew longer and stronger to help them run away. Epihippus had greater speed which made it able to outrun predators which lead to the Mesohippus. The Mesohippus was larger in size to have advantage on the grassland. Also the mesohippus had even longer legs. (www.saintjoe.edu).
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