About the Authors
Department of Cognitive Biology, University of Vienna, Vienna, Austria
Gfai tech GmbH, Berlin, Germany
Institute for Software Technology and Interactive Systems, Vienna University of Technology, Vienna, Austria
Department of Zoology and Entomology, Mammal Research Institute, University of Pretoria, Pretoria, South Africa
Section of Reproduction, Department of Production Animal Studies, University of Pretoria, Onderstepoort, South Africa
Adventures with Elephants, Bela Bela, South Africa
School of Psychology, University of Sussex, Brighton, United Kingdom
Since two authors (Gunnar Heilman and Sean Hensman) are employed commercial companies the authors want to declare that they did not pay for using the equipment nor for doing research with the elephant at Bela Bela. Therefore, both companies had no financial interest concerning the research. The fact that these authors are employed by these companies does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.
Conceived and designed the experiments: ASS GH. Performed the experiments: ASS GH SH AG. Analyzed the data: ASS MZ. Contributed reagents/materials/analysis tools: ASS MZ. Wrote the paper: ASS BDC.