The research team analyzed 117 recorded 'long calls' by Bornean orangutans, detecting 1,033 distinct pulses within them using 46 acoustic measurements to reveal a spectrum of complex vocalizations.
Orangutans exhibit a continuous gradation of sounds in their vocalizations, suggesting precise modulation abilities, allowing for complex messages to be communicated over distances.
Dr. Wendy Erb emphasized the importance of orangutan long calls in communication across dense rainforests, pointing towards much complexity yet to be unraveled in the ape's vocal system.
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