Monarch Clock Sun (IMAGE) University of Washington Caption Researchers have modeled how the monarch butterfly integrates its internal clock with the sun's position in the sky to find the southwestern direction and fly toward it each fall. Credit Eli Shlizerman Usage Restrictions Must include credit 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.