Did you know that the horse evolved in North America? The Hagerman Horse, Equus Simplicidens, Idaho’s state fossil, was the first true horse. It was about the size of a modern Arabian horse. However, its bones most closely resembled zebra bones, Grevy’s zebra to be exact. Hagerman is home to over two hundred different species of fossil plants and animals. The list includes Sabertooth Cat, a Hyena-like dog, Peccary, Mastodon, Otter, Bear, Shrew, Camel, and Ground Sloth, as well as many other species. With over 3,000 new fossil fragments found each year, it is one of the most fossiliferous Pliocene-aged sites in the world. Come explore our Visitor Center with the Discovery Center, fossil displays, introductory DVD and learn more about our fascinating fossil park!