Q: When is a horse not a horse?
A: When it's Hyracotherium.
Emily Troyer
Hyracotherium, the “dawn-horse,” was not closely related to horses at all, according to a fossil analysis that also traces the fast dispersals of the genera Pliolophus and Cardiolophus across three continents 56 million years ago. In PNAS: https://ow.ly/c8J450Y0O2O
