<em>Castoroides ohioensis</em> (IMAGE) Rensselaer Polytechnic Institute Caption The first fossil skull of Castoroides ohioensis found in 1845 alongside the skull of a modern beaver. Credit New York State Museum Usage Restrictions None License Licensed 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.