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Data are presented which show that changes in the colour of the paracallosal skin of female gelada baboons (Theropithecus gelada) are age-dependent. Variations in the quality and dispersion of the fluidfilled vesicles that border the female's chest patch during oestrus are also shown to be age-dependent. The physiological mechanisms that underlie these changes and their adaptive significance are discussed. © 1977 Academic Press Inc. (London) Limited.

Original publication




Journal article


Journal of Human Evolution

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