Culvert Closeup (IMAGE) University of Washington Caption Co-authors Erin D’Agnese and Maya Garber-Yonts (l-r) sampling upstream of a culvert in Chuckanut Creek in April 2021. The blue backpack contains a pump that sucks stream water through the yellow tubes to filter material for DNA analysis. Credit Elizabeth Andruszkiewicz Allan/University of Washington Usage Restrictions With credit License Original 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.