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Title: Proboscis monkeys (Nasalis larvatus (Wurmb, 1787)) have unusually high-pitched vocalizations
Authors: Srivathsan, A.
Meier, R. 
Keywords: Colobine
High frequency
Primate calls
Vocal communication
Issue Date: 31-Aug-2011
Citation: Srivathsan, A.,Meier, R. (2011-08-31). Proboscis monkeys (Nasalis larvatus (Wurmb, 1787)) have unusually high-pitched vocalizations. Raffles Bulletin of Zoology 59 (2) : 319-323. ScholarBank@NUS Repository.
Abstract: According to qualitative descriptions, proboscis monkeys have high frequency vocalizations, but no technical analysis of the calls is available because the species is rare, difficult to study in the field, and few zoological institutions have breeding populations. Here we analyse the high pitch vocalizations of captive proboscis monkeys in the Singapore Zoological Gardens. The monkeys produce very high frequency tonal vocalizations ranging from 1.4 kHz to 6.8 kHz. The calls are produced during acts of aggression or used as alarm calls and the pitch is higher than expected based on a comparative study for such a large primate. We discuss that the high frequency may be an adaptation for predator avoidance (crocodiles) and/or communication in dense vegetation. © National University of Singapore.
Source Title: Raffles Bulletin of Zoology
ISSN: 02172445
Appears in Collections:Staff Publications

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