Enjoy the beautiful scene of Music sounds as Maria and von Trapp’s children sing about the lonely Jasteld Jodel in the Austrian Alps (lay-ee-odl-lay-ee-odl-lay-hee-hoo).

Despite the picturesque moment, I was unfamiliar with these characters. Comparing their yodeling to that of monkeys in the rainforest of Latin America, it seems somewhat embarrassing.

Recent research conducted by Anglia Ruskin University (ARU) and the University of Vienna in collaboration with experts from Japan, Sweden, and Bolivia sheds light on this topic.

Through recordings and analysis of black and gold Howler monkeys, tufted capuchins, black-cap squirrel monkeys, and Peruvian spider monkeys at Randa Verde Wildlife Reserve in Bolivia, scientists discovered that these primates can jump three or more musical octaves at once, unlike human yodelers who span sub-octaves.

Dr. Jacob Dunn, an associate professor of evolutionary biology at ARU, highlighted how these voice leaps contribute to the primates’ communication abilities in complex social settings.

The unique vocalizations known as “ultra yodels” are made possible by the distinct anatomy of the monkey’s throat, specifically the vocal membrane. This thin tissue ribbon allows for extended pitch ranges, enhancing the monkeys’ vocal repertoire.

The evolution of monkeys’ vocal membranes contrasts with human vocal abilities, as they enhance pitch range but may lead to voice instability.

While humans yodel by shifting between voice registers, monkeys utilize vocal membranes to produce complex vocal patterns without the need for intricate neural control.

Not all monkeys excel at yodeling, with Latin American monkeys displaying a particular proficiency due to their vocal membranes. This suggests the importance of these calls for certain species.

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