Extinct North American Rhinos Lived in Huge Herds, Paleontologists Say

Paleontologists have examined teeth of Teleoceras major — an extinct species of rhinocerotid that lived in North America from 17.5 to 5 million years ago — found at the Ashfall Fossil Beds in Nebraska, the United States. Here, more than 100 Teleoceras major individuals at a single water hole died and were entombed in ash from an eruption of the Yellowstone supervolcano.