About the Authors
Biopsychology and Behavioral Neuroscience Program, The Graduate Center, The City University of New York, New York, New York, United States of America
Smithsonian National Zoological Park, Washington, D.C., United States of America
Department of Psychology, Hunter College, The City University of New York, New York, New York, United States of America
The authors have declared that no competing interests exist.
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.