How many years does the table include from the first species to the last Evolution of the horse?

The evolution of the horse spans approximately 55 million years, beginning with the earliest known ancestors in the Eocene epoch, such as Hyracotherium, around 55 million years ago, to the modern horse, Equus, which appeared around 5 million years ago. This timeline highlights significant evolutionary changes, including size, limb structure, and adaptations to different environments over millions of years.