The evolutionary history of horses from the Eocene to the present shows the progressive evolutionary change of a single species by natural selection.

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The evolutionary history of horses actually involves the gradual appearance and disappearance of many different species over time, each adapted to different environmental conditions, rather than a linear progression of a single species. While there is a general trend towards larger body size and more efficient running abilities, this is not a straightforward process and there are many branches and dead ends in the horse family tree.

The Evolutionary History of Horses from the Eocene to the Present