Looper (IMAGE) Rice University Caption Rice University biologists found that plants with altered circadian clocks were unable to defend themselves against leaf-eating cabbage looper caterpillars. Credit Tommy LaVergne/Rice University Usage Restrictions Must 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.