The diagram illustrates the evolutionary development of the horse over 40 million years, emphasizing physical transformations, particularly in limb and foot structure.
Overall, the horse evolved through distinct stages, becoming progressively larger and more adapted for speed, with a significant change in its foot—from multiple toes to a single hoof.
The earliest form, Eohippus, was a small creature with short limbs, a hairless back, and four toes. After 10 million years, Mesohippus appeared, displaying increased size, longer legs, and the initial formation of a mane. Merychippus followed, with a more upright posture, a well-developed mane, and enhanced musculature. The modern horse has inherited and refined these features, resulting in a powerful and agile animal.
Foot structure evolved concurrently. While Eohippus had four toes, later species had three, with the central toe enlarging over time. Today’s horse possesses a single, robust hoof, offering superior support and efficiency for fast mov
ement.