Contaminated Flowers (IMAGE) University of Pittsburgh Caption To determine whether nickel and aluminum in the flowers' nectar influenced bumblebee behavior, the researchers used two groups of uncontaminated flowers, one group of flowers contaminated by nickel, and another contaminated by aluminum. Credit University of Pittsburgh 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.