The relationship between man and his noble steed is almost as old as civilization itself. Ever since the mysterious beginning of our extraordinary partnership, horses helped shape the human world. At the speed of a horse, our ancestors conquered distances and built empires. Together, humans and horses flourished side by side. What makes us so perfect for each other? Discover how humans have partnered with the horse throughout the centuries, creating more than 400 breeds, from the Yakutian Horse to the Arab Horse, found all around the world.

Watch Equus: Story of the Horse: Chasing the Wind on Nature, tonight at 8pm on WGBH 2.

Pictured: Tyler Leather, Indian Relay jockey, during the Calgary Stampede