Equus stenonis

Equus stenonis is an extinct species of equine that lived in Western Eurasia, including Europe, during the Early Pleistocene. It was first named in 1867 from a skull found at Terranuova Bracciolini in Italy, and several subspecies have been described. Body mass varied from about 300 to over 500 kilograms, making it medium to large among equines, with a large elongated head, one-toed feet and robust limb bones. Fossils run from the Iberian Peninsula to Greece, the oldest about 2.5 million years old. It is thought to descend from the North American Equus simplicidens, arriving across the Bering Land Bridge about 2.6 million years ago, and it has been proposed as a possible direct ancestor of both zebras and asses. Tooth wear shows that it was a grazer.