A Monarch Butterly (2 of 2) (IMAGE) University of Guelph Caption A new study from the University of Guelph tracks monarch butterflies migration patterns, and follows them by generation. The study provides some clues as to why monarch butterflies' population numbers have been dropping recently. Credit University of Guelph - Jessica Linton Usage Restrictions None 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.