Play-Doh Helps Plant Research (IMAGE) University of Delaware Caption Ivan Hiltpold holds Play-Doh (plasticine) caterpillars designed to monitor birds preying on insects in response to plants sending out chemical pleas for help. Plant scientists refer to the chemicals as plant volatiles. Credit Monica Moriak 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.