Dartmouth Bee Disease Research (IMAGE) Dartmouth College Caption A bumble bee collecting nectar containing iridoid glycoside secondary metabolites from a turtlehead flower. Credit Leif Richardson Usage Restrictions Credit Leif Richardson 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.