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Additional Information

Competing Interests

The authors declare that they have no competing interests

Author Contributions

Moreen Uwimbabazi conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Richard W Wrangham conceived and designed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Zarin P Machanda contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Nancy L Conklin-Brittain contributed reagents/materials/analysis tools, reviewed drafts of the paper, provided training in biochemical analyses of food samples.

Jessica M Rothman conceived and designed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper, provided training in biochemical analyses of food samples.

Gilbert I Basuta conceived and designed the experiments, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

The research complied with all the regulations of Uganda Wildlife Authority and Uganda National Council for Science and Technology.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

Uganda Wildlife Authority and Uganda National Council for Science and Technology provided us a permit to conduct research in Kibale National Park.

Data Deposition

The following information was supplied regarding data availability:

Kibale Chimpanzee Project database

Funding

This study was financially supported by Kibale Chimpanzee Project and the Leakey Foundation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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