Trail camera photographs deer (IMAGE) Purdue University Caption Two white-tailed deer captured by a trail camera during a five-year study to determine the most effective method for monitoring wildlife population sizes. Credit Michigan State University / Mike Shaw Usage Restrictions News organizations may use this image in reports about the work of Purdue University’s Patrick Zollner and his collaborators. 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.