About 20 million years ago, during the Miocene Period, the Earth was drastically changing: great plains were developing, forests were thinning out, mountains were forming, and swamps were drying up. It is believed these developments affected many changes in the existing horse ancestors.
About 20 million years ago, during the Miocene Period, the Earth was drastically changing: great plains were developing, forests were thinning out, mountains were forming, and swamps were drying up. It is believed these developments affected many changes in the existing horse ancestors.
