River Otter in Duckweed Patch (image) University of Illinois at Urbana-Champaign Caption A new study found that river otters in Illinois are being exposed to dieldrin, DDE (a byproduct of DDT), PCBs and other chemicals banned decades ago. Credit Ivan Petrov Usage Restrictions Photo may be used only to accompany stories about the research described in this news release. Credit: Ivan Petrov 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.