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Supposedly 55 million years ago, in the Tropical rain forests of North America there were leaf eating animal the size of a dog. This distant ancestor of the horse evolved as part of the rise of the mammals that followed the extinction of dinosaurs.

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10,000 years ago in the Americas to Asia, they had eventually spread to Europe and suddenly disappeared.

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17,000 years ago in Lascaux, France, there were cave paintings that had beautifully displayed horses. Later, human societies named constellations after the horse.

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5000 BC in Kazakhstan Ancient knife marks found on thousands of horse bones show that these horses were raised for meat and perhaps milk.

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About 4000 years ago in the Middle East the earliest evidence of humans riding horses was found as 5000 year old fossils of worn down horse teeth.

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5000 years ago in the Middle East The fossils that were found indicate that a riding bit was placed in the animal's mouth. It is certainly possible that humans rode horses without bits long before that, but no physical evidence remains.

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Horse and the Persian Empire's Royal Road

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Horse and the Persian Empire's Royal Road

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Horse mounted messengers on the Persian Empire's Royal Road in the Fifth Century BCE could carry a message 1700 miles in seven days, it took 90 days by foot.

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About 2000 years ago, first appearing in China, with saddle and stirrup, warriors could now throw spears, slash with swords, or fire arrows.

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Electronic Communication and new forms of transformation made the horse obsolete for carrying messages

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Perhaps in the future the horse may have a more complex and important relationship with humans. Humans and horses have had a relationship for thousands of years. Horses perhaps understand humans in ways we don't even know.