Acknowledgements
We acknowledge all contributions by hunters and fishers who provided hunter-harvested and fishery-bycatch sample collection over the eight-year timeframe of this project. Additionally, we would like to acknowledge field and laboratory staff who participated in this project over the years, including Herman Dreki Guls, Íris Mýrdal Kristinsdóttir, and Sindri Gíslason for help with the capture and sampling of birds in Iceland, Sean Nashold and Joshua TeSlaa at the U.S. Geological Survey National Wildlife Health Center, and Tao Li, Wiriya Rutvisuttinunt, and Richard Jarman at the Walter Reed Army Institute of Research for sequencing virus isolates. We would like to acknowledge the Sudurnes Science and Learning Center, Sandgerdi, Iceland for providing lodging and laboratory support without which this project could not have succeeded. We also thank the reviewers for their comments and suggestions on previous versions of this article. The authors have no conflicts of interests to declare. This project was funded through the National Institute of Allergy and Infectious Diseases (grant #s: HHSN272201400008C, HHSN272201400008C). Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This article has been peer reviewed and approved for publication consistent with U.S. Geological Survey Fundamental Science Practices (https://pubs.usgs.gov/circ/1367/).