Stick Insect (image) University of Colorado at Boulder Share Print E-Mail Caption A new study involving CU-Boulder looks at the role of natural selection on three types of stick insect belonging to the species Timema cristinae. The illustration shows how green, striped, and melanistic, or brown varieties have evolved camouflaged appearances matching them to certain areas on two separate species of shrub. Credit Illustration credit Rosa Marin Usage Restrictions None Share Print E-Mail 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.