Hailing monarchs (IMAGE) University of Delaware Caption A new research study led by UD’s Michael Crossley titled “Opposing global change drivers counterbalance trends in breeding North American monarch butterflies” published in Global Change Biology on June 10. Credit Photo by Michele Walfred/ University of Delaware Usage Restrictions Must credit Michele Walfred/ University of Delaware 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.