The Gray Fossil Site in East Tennessee preserves the remains of a diverse ecosystem dating to a time called the Late Hemphillian Stage and home to tapirs, alligators, mastodons, red pandas, and more. Now, a study published in the Bulletin of the Florida Museum of Natural History unveils the latest new species from the site, a rhinoceros named Teleoceras aepysoma. At an estimated 4.5-4.9 million years old, these were among the very last rhinos in North America.