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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Sievert Rohwer analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Anthony D Fox analyzed the data, contributed reagents/materials/analysis tools, reviewed drafts of the paper, contributed the feathers.

Thomas Daniel analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, reviewed drafts of the paper.

Jeffery F Kelly performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Anthony Fox obtained special written permission from the Danish Forest and Nature Agency to cannon-net Greylag Geese on Saltholm and sample their feathers.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

The geese were caught under the Copenhagen University Natural History Museum Ringing Permit A600 “DMU-Kalø Ringmærkning.”

Funding

The Øresund Consortium provided financial support of the original fieldwork. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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