One of the most intriguing examples of mammal evolution would be the horses. When they first began, the earliest horses, Propalaeotherium, were no larger than cats. These small creatures had feet that possessed four hoof-like toes. Due to their status as a prey item for predators, these animals were very skittish, ready to bolt at the slightest sound. As time went on, this small horse evolved and diversified into many forms. Some walked like gorillas and ate like pandas, some resembled rhinos and were twice as big as modern rhinos, and the rest became the horses we know today. I wonder if reverse engineered modern horses could turn into something resembling Propalaeotherium or the species that succeeded it. This will be something I will tinker with as I continue my dinosaur series.