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Horse Evolution The horse family is a classic example of evolution and is supported by extensive fossil evidence. It has been comprehensively studied to form possibly the most complete evolution of any animal after humans. Horses are believed to have first appeared around 55 million years ago in the form of the Hyracotherium, or 'hyrax-like beast' (The World Book Encyclopedia). They originally inhabited North America and Europe, where the oldest fossils of possible ancestors were found (Encyclopædia Britannica, 2007). The Przewalski's Horse, Equus ferus przewalskii or Equus caballus przewalskii, belongs to the family Equidae in the order Perissodactyla, which means odd-toed ungulates (Wikipedia, 2007). Animals in this order all have hoofed feet with an odd number of toes, mobile upper lips and similar tooth structure. Other animal families in this order are tapirs and rhinoceroses. In the evolution of the horse, the change of the teeth, toes, legs and overall shape of...

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