Funding for this research was provided by:
Received: 29 May 2019
Accepted: 3 October 2019
First Online: 28 October 2019
Ethics approval and consent to participate
: The Norwegian Food Safety Authority has approved this study. The Norwegian Food Safety Authority has a designated ethics committee with the power to grant ethical approval (The Norwegian Animal Research Authority). Land permissions at the local, national and international level were not required in order to catch the birds in this study. The decision is pursuant to the Norwegian Regulation on Animal Experimentation.
: Not applicable.
: The authors declare that they have no competing interests.