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Abstract

Garcia and Dunn [1] raise some interesting and valuable points regarding our recent paper in Current Biology [2]. As Garcia and Dunn [1] point out, cross-species variation in vocal and anatomical relations allows for the identification of relevant outliers from the body size — fundamental frequency (f0) regression. However, this depends on the premise that the chosen or available f0 and body size values are typical of the species. A motivation for our study [2] was in part to improve the accuracy of such estimates by providing more data per species compared to previous studies. We address each point of their critique by controlling for cross-species body size variation using body weights for chimpanzees (Pan troglodytes) and bonobos (Pan paniscus), addressing potential call variation in different subspecies of Pan troglodytes, measuring minimum f0 as well as maximum f0 and possible effects caused by different larynx fixation methods. Grawunder et al. Respond to the concerns raised by Garcia and Dunn on their original study.