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...chimpanzees and bonobos also make liberal use of gestures in addition to the sounds and facial expressions that are part of their communication system...
M. Rückert, P. Vogel, and V. Behr. page #645, Aachen, Germany. (March 2023)also in: Int. J. Magn. Part. Imag. (2023). 9(1s1) 2303084. (doi: 10.18416/IJMPI.2023.2303084).