How the Mammoth Got its Wool: Genetic Changes (image) Penn State Share Print E-Mail Caption These are woolly mammoths. Credit Image courtesy of Giant Screen Films (©) 2012 D3D Age, LLC Usage Restrictions The credit information, including the copyright symbol, must be published along with the image. Share Print E-Mail 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.