Equus is the genus name for the modern horse and its close relatives. The first representatives of this genus arose roughly four million years ago. Thus Equus has lived during the Neogene and...
Hyracotherium ("Hyrax-like beast") (also known as Eohippus) was a dog-sized perissodactyl ungulate that lived in the Northern Hemisphere, with species ranging throughout Asia, Europe, and North...