Equus giganteus

The giant horse, Equus giganteus, is a dubious extinct species of horse that lived in North America. It was classified from a single tooth found in Texas that was larger than the teeth of even the largest modern draft horses. From that tooth its weight was estimated at 1,200 to 1,500 kilograms and its height at 2.25 metres at the shoulder. Because the species rests on fragmentary remains, later authors have treated it as a nomen dubium, a name whose application cannot be fixed with confidence, so its place among the equines of the genus Equus remains uncertain.