Greg Wilson, University of Washington (IMAGE) University of Washington Caption Dr. Gregory Wilson, Burke Museum Adjunct Curator of Vertebrate Paleontology and University of Washington Associate Professor of Biology, holds a fossilized Didelphodon skull. Credit Burke Museum of Natural History & Culture Usage Restrictions Must include credit 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.