Grawunder, S.; Crockford, C.; Kalan, A. K.; Clay, Z.; Stoessel, A.; Hohmann, G.: Response to Garcia and Dunn: No evidence that maximum fundamental frequency reflects selection for signal diminution in bonobos Response. Current Biology 29 (15), pp. R734 - R735 (2019)
Scientists studying a rare population of tool-using chimpanzees have found that aging can have a profound impact on their abilities—but not all chimps decline equally.