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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Alejandro Sanchez-Amaro 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.

Shona Duguid conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Josep Call conceived and designed the experiments, reviewed drafts of the paper.

Michael Tomasello conceived and designed the experiments, reviewed drafts of the paper.

Human Ethics

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

The study was ethically approved by an internal committee at the Max Planck Institute for Evolutionary Anthropology.

Animal Ethics

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

The study was ethically approved by an internal committee at the Max Planck Institute for Evolutionary Anthropology. Animal husbandry and research comply with the “EAZA Minimum Standards for the Accommodation and Care of Animals in Zoos and Aquaria”, the “WAZA Ethical Guidelines for the Conduct of Research on Animals by Zoos and Aquariums” and the “Guidelines for the Treatment of Animals in Behavioural Research and Teaching” of the Association for the Study of Animal Behaviour.

Data Deposition

The following information was supplied regarding data availability:

No raw data, just abstract

Funding

A. Sánchez-Amaro was partially supported by a LaCaixa-DAAD grant (13/94418). J. Call was partially supported by an ERC-Synergy grant SOMICS. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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