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).