Kalan, Ammie K. Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
https://rs.figshare.com/collections/Supplementary_material_from_Chimpanzees_use_tree_species_with_a_resonant_timbre_for_accumulative_stone_throwing_/4768811 (Supplementary material)
Kalan, A. K., Carmignani, E., Kronland-Martinet, R., Ystad, S., Chatron, J., & Aramaki, M. (2019). Chimpanzees use tree species with a resonant timbre for accumulative stone throwing. Biology Letters, 15(12): 20190747. doi:10.1098/rsbl.2019.0747.