Free-living mallards in Sweden. This material relates to a paper that appeared in the 14 October 2016, issue of Science, published by AAAS. The paper, by S.J. Lycett at University of Edinburgh in Edinburgh, UK, and colleagues was titled, "Role for migratory wild birds in the global spread of avian influenza H5N8."
Please cite the owner of the material when publishing. This material may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission.