Pleistocene aurochs (IMAGE) Trinity College Dublin Caption A Pleistocene aurochs from the Upper Rhine Valley, dated to around 50,000 years old. Credit Staatliche Schlösser und Gärten Hessen. Usage Restrictions None. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.