About the Authors

Marijn van Wingerden

Contributed equally to this work with: Marijn van Wingerden, Christine Marx

Marijn.Wingerden@hhu.de

Affiliation Comparative Psychology, Institute for Experimental Psychology, Heinrich-Heine University Düsseldorf, Universitätsstrasse 1, D-40225, Düsseldorf, Germany

Christine Marx

Contributed equally to this work with: Marijn van Wingerden, Christine Marx

Affiliation Comparative Psychology, Institute for Experimental Psychology, Heinrich-Heine University Düsseldorf, Universitätsstrasse 1, D-40225, Düsseldorf, Germany

Tobias Kalenscher

Affiliation Comparative Psychology, Institute for Experimental Psychology, Heinrich-Heine University Düsseldorf, Universitätsstrasse 1, D-40225, Düsseldorf, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CM TK. Performed the experiments: CM. Analyzed the data: MvW. Contributed reagents/materials/analysis tools: MvW. Wrote the paper: MvW TK.