This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:


peer-reviewed publication

trusted source


Scientists unlock mysteries of orangutan communication

Scientists unlock mysteries of orangutan communication
Spectrogram depicting long call pulse types. Pulses include HU = huitus, VO = volcano, HR = (high) roar, LR = low roar, IN = intermediary, SI = sigh. Spectrograms produced in Raven Pro 1.6. Credit: PeerJ (2024). DOI: 10.7717/peerj.17320

In a study published in PeerJ, scientists have revealed the intricate vocal patterns of Bornean orangutans, shedding new light on the complexities of their communication. Titled "Vocal Complexity in the Long Calls of Bornean Orangutans," the research, led by Dr. Wendy Erb from the K. Lisa Yang Center for Conservation Bioacoustics at the Cornell Lab of Ornithology, unveils the remarkable diversity and variability within orangutan long call vocalizations.

Orangutans, the charismatic great apes of Southeast Asia, are known for their complex social behaviors and vocal communication. However, understanding the nuances of their vocal repertoire has posed a significant challenge for researchers. Dr. Wendy Erb and her team embarked on a pioneering journey to decipher the mysteries of vocalizations, and their findings are set to revolutionize our understanding of these remarkable primates.

Dr. Erb, a primatologist specializing in the behavior and communication of wild primates, explained, "Our research aimed to unravel the complexities of orangutan long calls, which play a crucial role in their communication across vast distances in the dense rainforests of Indonesia. Over the course of three years, we accumulated hundreds of long call recordings, revealing a fascinating array of vocal diversity."

The study employed a multidimensional approach, combining traditional audio-visual methods with state-of-the-art machine learning techniques. Dr. Erb and her team meticulously analyzed the long calls of 13 individual orangutans, aiming to determine the number of pulse types present in their vocalizations and evaluate their gradation.

"Through a combination of supervised and unsupervised analytical methods, we identified three distinct pulse types that were well differentiated by both humans and machines," Dr. Erb said.

"While our study represents a significant step forward in understanding orangutan communication, there is still much to uncover. Orangutans may possess a far greater repertoire of sound types than we have described, highlighting the complexity of their vocal system."

The research not only deepens our understanding of orangutan communication but also underscores the broader concept of vocal complexity in the animal kingdom. Dr. Erb emphasized the behind the study, acknowledging the dedication of her team and the importance of interdisciplinary collaboration in .

"This study represents the culmination of months of hard work and collaboration, demonstrating the power of collective effort in advancing our understanding of nature's intricacies," Dr. Erb stated. "We hope that our findings inspire further exploration of vocal complexity across different species and pave the way for future discoveries in animal ."

More information: Wendy M. Erb et al, Vocal complexity in the long calls of Bornean orangutans, PeerJ (2024). DOI: 10.7717/peerj.17320

Journal information: PeerJ

Provided by PeerJ

Citation: Scientists unlock mysteries of orangutan communication (2024, May 14) retrieved 14 June 2024 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Chimpanzees found to combine calls to form numerous vocal sequences


Feedback to editors