The Hagerman Horse is an extinct species of horse that lived during the late Pleistocene epoch, around 3 million years ago. Fossils of this horse were first discovered in Hagerman, Idaho, which is how it got its name. It is believed to be one of the earliest ancestors of modern horses, showcasing features similar to both horses and zebras. This horse was relatively small, standing about 12 to 14 hands high, and had a stocky build. The Hagerman Horse is significant for understanding the evolution of equines and the environmental conditions of its time, providing insights into prehistoric ecosystems.