Dan Salkeld, Stanford University (image) Stanford University Caption Stanford University postdoc Dan Salkeld has been studying prairie dogs for years. Credit Dan Tripp Usage Restrictions Use of this photograph is for one-time use only by permission of the Woods Institute for the Environment at Stanford University. 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.