Guerra (IMAGE) University of Cincinnati Caption University of Cincinnati biologists found that light pollution can affect the internal clocks of migrating monarch butterflies, impeding their ability to navigate during the day. Credit Lisa Ventre/UC Creative Usage Restrictions None 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.