Sandra Olsen, excavation, horse bone with cut marks, stone tools, team of scientists, thongsmoother, sacrificial pit, woman milking mare, boys riding horse: © Sandra Olsen Chauvet cave painting: © Jean Clottes horse pulling streetcar: © Library of Congress Pony Express stamp: ©; L. Cunliffe / AGE Fotostock world map showing Kazakstan: © AMNH artist reconstruction of Botai pithouse: © Mark Klingler computer model of Krasnyi Yar village: © Ashley Brickman The Horse exhibition: © AMNH / Denis Finnin