Changing environments and ecosystems were driving the evolution of horses over the past 20 million years. In fact, Cantalapiedra and colleagues were able to show that all these newly evolved species of horses were ecologically very similar.
Environmental changes would have produced a lot more fragmented, mosaic-type ecosystems, where populations of horses with similar demands and adaptations could have evolved isolated from one another, resulting in different species but with a similar appearance , points Manuel Hernandez Fernandez at the Complutense Univerity in Madrid. https://www.sciencedaily.com/releases/2017/02/170209142648.htm
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February 2017
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