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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Raf Aerts wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, reprint permissions of photographs.

Valerie Dewaelheyns wrote the paper, reviewed drafts of the paper.

Wouter MJ Achten wrote the paper, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate, collect or analyse any raw data or code.

Funding

The authors received no funding for this work.


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