An analysis of mitochondrial and nuclear DNA from fossils of extinct New World stilt-legged horses reveals that, contrary to previous findings, these enigmatic animals actually belonged outside of the horse genus Equus. This illustration depicts a family of New World stilt-legged horses (Haringtonhippus francisci) in Yukon, Canada, during the last Ice Age. Image credit: Jorge Blanco. “The horse family, thanks to its rich and deep fossil record,...
