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Keywords: Ultrasonic vocalizations
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Folia Primatol (2015) 86 (3): 153–163.
Published Online: 03 June 2015
... was placed at the base of the group's sleeping tree and recorded from 5.00 to 7.00 h using an omnidirectional microphone. The ultrasonic vocalizations fell into 5 main categories: chirps, twitters, choruses, doubles and whistles. Chirps were the most frequent ultrasonic vocalizations, followed by twitters...