Hagerman Horse (Equus simplicidens), also called the Hagerman Zebra or the American Zebra, is a species of equid that lived during the Late Pliocene to Late Pleistocene in what is now North America.
In the Series 3 finale "Mammoth's Undertaking Journey", a herd of a dozen Hagerman Horses were brought to the park from Late Pleistocene North America 11,000 years ago. They reside in the Mammoth Tundra Enclosure with other ice age animals.