Bonobos have a more human-like second-to-fourth finger length ratio (2D:4D) than chimpanzees: a hypothesized indication of lower prenatal androgens.

@article{McIntyre2009BonobosHA,
  title={Bonobos have a more human-like second-to-fourth finger length ratio (2D:4D) than chimpanzees: a hypothesized indication of lower prenatal androgens.},
  author={M. H. McIntyre and Esther Herrmann and Victoria Elizabeth Wobber and Michel Halbwax and Crispin Mohamba and Nick de Sousa and Rebeca Atencia and Debby Cox and Brian A. Hare},
  journal={Journal of human evolution},
  year={2009},
  volume={56 4},
  pages={
          361-5
        }
}
The ratio of the second-to-fourth finger lengths (2D:4D) has been proposed as an indicator of prenatal sex differentiation. However, 2D:4D has not been studied in the closest living human relatives, chimpanzees (Pan troglodytes) and bonobos (Pan paniscus). We report the results from 79 chimpanzees and 39 bonobos of both sexes, including infants, juveniles, and adults. We observed the expected sex difference in 2D:4D, and substantially higher, more human-like, 2D:4D in bonobos than chimpanzees… CONTINUE READING
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