Acknowledgements:
We are grateful to Holger Villwock, Leonie Haferkemper and Robyn
Övergaard for taking excellent care on the perch during the experiments.
In addition, Holger Villwock greatly helped during the sampling campaign
and Robyn Övergaard assisted during metabolic trials.
Author Contributions: KS did the conceptualization and wrote
the first draft. KS, MLA, FC, and PE collected data; KS and MLA analyzed
the data. All authors helped writing and gave final approval for
publication.
Data availability : Data and R scripts are available from the
Zenodo Digital Repository (http://doi.org/10.5281/zenodo.4433723).