Possum with grey fur (IMAGE) University of Otago Caption Researchers from New Zealand's University of Otago, Ōtākou Whakaihu Waka and Manaaki Whenua Landcare Research have found the gene which determines if a marsupial's fur will be black or grey like this possum's. Credit Donna Bond/University of Otago Usage Restrictions Nil 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.