|Skeleton in Carnegie Museum of Natural History|
This species represents the larger end of the prehistoric horse spectrum - it was about the size of a mustang, weighing up to 519 kg (1144 lbs). It was a stoutly built animal and resembled the extinct quagga or the modern plains zebra, although it was not a close relative to either of these.
- Klide, A. M. (1989). "Overriding vertebral spinous processes in the extinct horse, Equus occidentalis". American Journal of Veterinary Research. 50 (4): 592–593. PMID 2712429.
- "Turn your head and roar: can diagnosing disease in fossils shed light on modern maladies? - Free Online Library". www.thefreelibrary.com. Retrieved 2017-12-10.