About the Authors

Gottfried Sachs

Affiliation Institute of Flight System Dynamics, Technische Universität München, Garching, Germany

Johannes Traugott

Affiliation Institute of Flight System Dynamics, Technische Universität München, Garching, Germany

Anna P. Nesterova

Affiliation Behavioural Ecology Group, Centre d'Ecologie Fonctionnelle et Evolutive, U.M.R., 5175 CNRS, Montpellier, France

Giacomo Dell'Omo

Affiliation Ornis italica, Rome, Italy

Franz Kümmeth

Affiliation e-obs GmbH, Grünwald, Germany

Wolfgang Heidrich

Affiliation e-obs GmbH, Grünwald, Germany

Alexei L. Vyssotski

Contributed equally to this work with: Alexei L. Vyssotski, Francesco Bonadonna

Affiliation Institute of Neuroinformatics, University of Zurich/ETH Zurich, Zurich, Switzerland

Francesco Bonadonna

Contributed equally to this work with: Alexei L. Vyssotski, Francesco Bonadonna

francesco.bonadonna@cefe.cnrs.fr

Affiliation Behavioural Ecology Group, Centre d'Ecologie Fonctionnelle et Evolutive, U.M.R., 5175 CNRS, Montpellier, France

Competing Interests

Franz Kümmeth and Wolfgang Heidrich are the owners of the company e-obs GmbH, and Giacomo Dell'Omo is the owner of Technosmart which built the GPS data loggers used in this study. This does not alter their adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: GS JT FB. Performed the experiments: JT APN. Analyzed the data: JT. Contributed reagents/materials/analysis tools: GS JT GD FK WH ALV. Wrote the paper: GS JT APN FB ALV.