The diagram illustrates the evolution of the horse over a period of time of 40 million years, focusing on changes in its overall size and foot structure.
Over time, the horse has transformed from a small, multi-toed creature into a larger, single-toed animal. The changes in its foot structure highlighted adaptations to its environment.
The earliest stage, represented by the Eohippus, dates back 40 million years. This animal was relatively small, with a short tail and four distinct toes. By 30 million years ago, the Mesohippus had evolved, It was slightly larger, with a longer body and three toes that were more defined and prominent than those of its predecessor.
Fifteen million years ago, the Merychippus appeared, making a significant shift in the horse’s evolution. This species had a more elongated body and a longer neck, with three toes that were partially fused. Finally, the modern horse has a robust, muscular build and a single-toed foot structure.
