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For the analysis, scientists used computed tomography, creating digital models of the nasal passages of adult and young proboscis monkeys. In adults, the noses are longer and change the sound more strongly, emphasizing their maturity. Experiments with replicas confirmed the role of the nose in the formation of sound characteristics.
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Vocal individuality is especially important for proboscis monkeys, as they live in complex social groups, where males regularly encounter each other, and females are constantly moving. The ability to recognize relatives by voice helps to avoid unnecessary conflicts and makes communication more effective.
