Bonobos make themselves appear ‘smaller’ than they actually are

Although bonobos and chimpanzees are similar in size, bonobo calls sound an octave higher than chimpanzee calls. Researchers explain this discrepancy with the fact that the vocal folds of bonobos are only half as long as those of chimpanzees of the same age. Whether or not other factors have contributed to this discrepancy is subject to further research. https://www.sciencedaily.com/releases/2018/10/181023085737.htm