1. Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, USA
2. ElephantVoices, Sandefjord, Norway
3. Mammal Communication Lab, Department of Cognitive Biology, University of Vienna, Vienna, Austria
4. Elephant Listening Project, Cornell Lab of Ornithology, Ithaca, NY, USA
5. Department of Otolargyngology, Head and Neck Surgery, Stanford University School of Medicine, Stanford, CA, USA
6. Department of Zoology, Natural Sciences, Open University of Sri Lanka, Nawala, Nugegoda, Sri Lanka
7. Division of Biological Sciences, UC San Diego, Ecology Behavior and Evolution Section, CA, USA