About the Authors

Nathan R. Senner

n.r.senner@rug.nl

Current Address: Animal Ecology Group, University of Groningen, Groningen, The Netherlands

Affiliation Cornell Lab of Ornithology, Cornell University, Ithaca, New York, United States of America

Wesley M. Hochachka

Affiliation Cornell Lab of Ornithology, Cornell University, Ithaca, New York, United States of America

James W. Fox

Current address: Migrate Technology Ltd., Coton, Cambridge, United Kingdom

Affiliation British Antarctic Survey, Cambridge, United Kingdom

Vsevolod Afanasyev

Affiliation British Antarctic Survey, Cambridge, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NRS WMH. Performed the experiments: NRS. Analyzed the data: NRS WMH. Contributed reagents/materials/analysis tools: NRS JWF VA. Wrote the paper: NRS WMH. Developed technology employed in the study: VA JWF.