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Keywords: Orangutan
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Journal Articles
J Exp Biol (2015) 218 (6): 907–914.
Published: 15 March 2015
...Bart de Boer; Serge A. Wich; Madeleine E. Hardus; Adriano R. Lameira ABSTRACT Orangutans produce alarm calls called kiss-squeaks, which they sometimes modify by putting a hand in front of their mouth. Through theoretical models and observational evidence, we show that using the hand when making...