PAUL WOOTTON / SCIENCE PHOTO LIBRARY PAUL WOOTTON / SCIENCE PHOTO LIBRARY
Evolution of Przewalski's horse. Artwork showing the ancestral equid Hyracotherium sp. (left) evolving into Przewalski's horse (Equus ferus przewalskii). Przewalski's horse is also known as the Mongolian wild horse, Asian wild horse and Dzungarian horse. It is critically endangered (as of 2009).
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