Keel-Billed Toucan Carrying Cicada (image) Smithsonian Tropical Research Institute Caption A survey of more than 100 experiments on birds, bats and lizards from four continents showed that small, interguild predators increase plant biomass by consuming herbivores and their insect predators. Credit Christian Ziegler Usage Restrictions This image is for web use only. For print use, please contact Christian Ziegler, email@example.com. Credit: Christian Ziegler 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.