Dragonfly Larva (IMAGE) Dartmouth College Caption Before turning into adults, dragonfly larvae can be collected easily by citizen scientists and used as "biosentinels" to study mercury pollution. Credit Dartmouth Toxic Metals Superfund Research Program. 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.