E is for Epihippus – #AtoZChallenge – 2017 – Uintan Mammals E is for Epihippus. Epihippus is a fossil horse. You know it’s a horse because of the ‘hippus’ in its name, which means ‘horse.’ These horses were smaller than modern horses and possessed four hoofed toes on its front legs and three hoofed toes on its back legs. Epihippus gracilis. Credit: U.S. National Park Service. Share this:TwitterFacebookLike this:Like Loading... Related Published by paleololigo Scientist (Paleontology, Geochemistry, Geology); Writer (Speculative and Science Fiction, plus technical and non-technical Science); Mom to great boy on the Autism spectrum; possessor of too many hobbies. View all posts by paleololigo