In the Late Oligocene, a period of time that lasted from about 26 to 24 million years ago, the North American and Eurasian rhinoceros populations diverged. The North American rhinoceros, later to be

Scenario: Let's imagine a world where members of the family Hyracodontidae, including Hyracodon, somehow managed to defy the boundaries of time and succeeded in surviving past the Oligocene epoch, maintaining their existence and evolving right into our contemporary ecosystem in both Eurasia and North America. Through the Miocene and Pliocene epochs, these rhinoceroses continued to adapt; the cold drought stimulated a significant increase in size, essentially increasing their body mass to adapt to the harsh cold as it did for mammoths and other large mammals. Their teeth evolved, diversifying to allow for the consumption of grasses that became more common due to the changing climates, reflecting more the characteristics of modern grazing herbivores. Moreover, a thick, woolly fur coating may have developed for better insulation as the global temperatures dropped during these periods. Hyracodontidae also likely evolved to be more social animals, living in large groups (or crash), which contributed to their survival strategy against predators and helped in collective foraging. They preserved sexual dimorphism with males likely being larger and equipped with larger horns for the purpose of dominance fights and attracting mates. As the Pleistocene epoch approached, the subsequent ice ages further forged their evolution. By this time, two sub-species might have come into existence: the Tundra Hyracodon with a white fur coat, adapted to the snow-filled landscapes of the northern parts, and the Forest Hyracodon, with a dark brown or green fur coat, mirroring the forests of central Eurasia and North America. With humans' arrival in these parts of the world, Hyracodontidae would have developed a cautious nature and heightened sensitivity to human activities. To adapt to human civilization's encroachment, their foraging patterns would have changed to nighttime to avoid human contact, thus becoming more nocturnal. Today, we might have found these mammals in the expansive snowscapes of the Eurasian steppe or the dense North American forests, proving their resilience and adaptability and serving as captivating symbols of a prehistoric past still living among us. Conservation efforts would be necessary to protect these ancient creatures in our modern ecosystem, highlighting the link between our world and theirs.