The voice of the bonobos makes them look smaller

The voice of the bonobos makes them look smaller https://i2.wp.com/www.eresviral.com/wp-content/uploads/2018/11/La-voz-de-los-bonobos-les-hace-parecer-más-pequeños.jpg?fit=211%2C146&ssl=1

The voice of the bonobos makes them look smaller







Only by listening to the voice of a person can we imagine if it is big or small. This paradigm has been the most accepted for a long time in research on acoustic communication. However, there are exceptions among animals.



Several species, such as chimpanzees, are capable of producing sounds more serious than expected with respect to their body size. This makes them look bigger than they really are.



Now, a team from the Max Planck Institute for Evolutionary Anthropology in Germany has found a case so far unique among animals: the bonobos emit calls that make them look smaller, a significant difference respect to their chimpanzee cousins.



The study, published this week in the journal Current Biology, has allowed us to analyze the morphological structures of the larynx, the sound producing organ of mammalian species.



When examining the vibrating parts of the larynx, the scientists detected that the differences in the voice of both species are found in the length of the vocal fold: that of the chimpanzees is twice as long as those of the bonobos.







Although bonobos and chimpanzees are similar in size, bonobo calls sound an octave higher than those of chimpanzees. (Photo: Cédric Girard-Buttoz, LuiKotale, D.R. Kongo)



The bonobos do not stand out only because of their more acute tone of voice. In general, although they are physically very similar to chimpanzees - with whom they share gender - these great apes are differentiated by many other characteristics.



One is that, compared to most other species, females can dominate males. In addition, the bonobos, who are characterized by their great sexual activity and for being peaceful, are also very tolerant with the other individuals within the group, and especially outside the group.



"Therefore, a possible explanation for the acute voice of the male and female bonobos is that it signals tolerance towards individuals inside and outside the group, which facilitates non-aggressive interactions between them," concludes Gottfried Hohmann, of the German institution. and principal author of the study. (Source: SINC)

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