Pantanal (IMAGE) American Museum of Natural History Caption This is the Pantanal, the world's largest tropical wetland, and one of the freshwater areas surveyed for the study. Credit ©M. Lemke Usage Restrictions Can be used with appropriate credit 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.