Killer Whales (IMAGE) Oregon State University Caption Oregon State University researchers used environmental DNA filtered from seawater, to detect the passage of endangered killer whales in Puget Sound. Credit C. Emmons, NOAA Fisheries. 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.