Equus giganteus

The giant horse (Equus giganteus) is an extinct species of horse which lived in North America.

It was classified as a species based on the finding of a single tooth larger than the teeth of even the largest modern draft horses. Based on the tooth, the weight was estimated at 1,200 - 1,500 kg and the height at 2.25 m tall at the shoulder. Because it is based on fragmentary remains, recent authors have considered the species to be an invalid nomen dubium.