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    • Acoustic models of orangutan hand-assisted alarm calls 

      De Boer, Bart; Wich, Serge A.; Hardus, Madeleine E.; Lameira, Adriano R. (2015-03-18) - Journal article
      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 a ...