Chameleon Prawns (IMAGE) University of Exeter Caption Chameleon prawns (Hippolyte varians) take weeks to change color. Credit Martin Stevens Usage Restrictions This image may only be used with reports of this research 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.