Nimravus is an extinct genus of "false" saber-toothed cat that lived in North America and Eurasia during the Eocene and Oligocene epochs 35.3—27.1 mya, existing for approximately 7.9 million years. No

Urtinotherium is an extinct genus of paracerathere mammals. It was a large animal that was closely related to Paraceratherium, and found in rocks dating from the Late Eocene to Early Oligocene period.