Early horse (composite)

Early Horse Evolution
The earliest horses, such as Eohippus, were small, dog-size browsers with short legs ending in three to five small toes. Most of the oldest horse fossils are from about 56 million years ago in North America.

Like many mammal lineages, horses evolved to larger sizes over millions of years. They also diversified into a range of habitats, with some species evolving into specialized grazers.