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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Christos Barboutis performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables.

Ian Henshaw performed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper, editing and suggesting changes in an earlier version of the manuscript.

Cecilia Kullberg performed the experiments, reviewed drafts of the paper, editing and suggesting changes in an earlier version of the manuscript.

Stamatina Nikolopoulou contributed reagents/materials/analysis tools, reviewed drafts of the paper, editing and suggesting changes in an earlier version of the manuscript.

Thord Fransson conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables.

Animal Ethics

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

Handling vertebrate animals in Greece does not require a special permit if you are a member of a University (the first author was indeed a PhD student at University of Crete at the time of the study). Despite that, we asked for and received a permit for handling birds and attaching radio-transmitters, from the Greek Ministry of Agriculture (Reference number: 89890 / 1448).

Field Study Permissions

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

The study was carried out with the permission of the Greek Ministry of Agriculture and the Hellenic Bird Ringing Centre.

Funding

TF received financial support from Helge Ax:son Johnsons Foundation, the Friendship Association of the Swedish Museum of Natural History, Stiftelsen Längmanska Kulturfonden and Marie-Claire Cronstedts Foundation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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