1. Female rhesus macaques discriminate unfamiliar paternal sisters in playback experiments: support for acoustic phenotype matching by Dana Pfefferle, Angelina V. Ruiz-Lambides, and Anja Widdig Proceedings B Volume 281(1774):20131628 January 7, 2014 ©2014 by The Royal Society

2. Probability of females to respond when presented with calls of a paternal kin (i.e. half-sister) versus non-kin. *p < 0.01. Dana Pfefferle et al. Proc. R. Soc. B 2014;281:20131628 ©2014 by The Royal Society

3. Probability of females to respond when presented with calls of familiar peers, familiar non-peers or unfamiliar individuals. Dana Pfefferle et al. Proc. R. Soc. B 2014;281:20131628 ©2014 by The Royal Society