About the Authors

Preston Foerder, Diana Reiss
Biopsychology and Behavioral Neuroscience Program, The Graduate Center, The City University of New York, New York, New York, United States of America

Marie Galloway, Tony Barthel, Donald E. Moore III
Smithsonian National Zoological Park, Washington, D.C., United States of America

Diana Reiss
Department of Psychology, Hunter College, The City University of New York, New York, New York, United States of America

Corresponding Author

dlr28@columbia.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PF DR. Performed the experiments: PF MG TB. Analyzed the data: PF DR. Wrote the paper: PF DR. Animal management: MG TB DEM. Facilitated NZP research: DEM.