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Journal: Journal of Experimental Biology
J Exp Biol (2015) 218 (6): 907–914.
Published: 15 March 2015
... the size of the producer. Using the hand appears to be a culturally learned behavior, and therefore orangutans may be able to associate the acoustic effect of using the hand with potentially more effective deterrence of predators. Orangutan Kiss-squeak Sound production Size exaggeration Deception...