1. School of Mathematics and Statistics University of Sheffield Hicks Building Hounsfield Road Sheffield S3 7RH UK
2. School of Mathematics and Statistics University Gardens University of Glasgow Glasgow G12 8QW UK
3. National Wildlife Management Centre Animal and Plant Health Agency Sand Hutton York YO41 1LZ UK
4. Department of Migration and Immuno‐ecology Max‐Planck‐Institute for Ornithology Am Obstberg 1 78315 Radolfzell Germany
5. Department of Biology University of Konstanz Universitätsstraβe 10 78464 Konstanz Germany