Discuss the evolutionary history of horse. Add a note on the role of climate in the evolution of horse. 

The evolutionary history of horses is a fascinating story that spans over 50 million years. Horses are members of the family Equidae and belong to the order Perissodactyla, which also includes rhinoceroses and tapirs. The earliest known horses, called Hyracotherium, lived about 55 million years ago in what is now North America. These early horses were small, about the size of a dog, and had four toes on their front feet and three toes on their hind feet.

Over the next 20 million years, horses evolved and adapted to their environments. As the Earth's climate changed, the grasslands expanded, and horses evolved to become better adapted to running and grazing on these grasslands. Over time, the number of toes on their front and hind feet reduced, and they developed a single, large hoof on each foot that was better suited to running and grazing.

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