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A unique case of extra-group infant adoption in free-ranging Angola black and white colobus monkeys (Colobus angolensis palliatus)

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Abstract

Infant adoption has been reported in a variety of primate taxa both in captive and natural settings. Adoption by females may be adaptive by increasing inclusive fitness via shared genes between adoptive mother and adoptee or by providing valuable maternal practice which, in turn, may increase the female’s future reproductive success. Others have argued that adoption may be non-adaptive and the result of a general attraction toward infants. Our study examines a unique case of adoption by an adult female Angola black and white colobus monkey (Colobus angolensis palliatus) who adopted an extra-group infant alongside her own biological infant. We compare infant behaviors and mother-infant interactions between biological infant and adoptee and then compare both biological infant and adoptee behavioral profiles to those of infants under normal circumstances. Data were collected from July 2014 to June 2015 on three habituated groups in the Diani Forest of Kenya. Scan sampling and pooled data were used to create daily and monthly behavioral profiles for the biological infant and adoptee, as well as a mean monthly profile of four infants under normal circumstances. Data include time spent (1) clinging to mother/adoptive mother, (2) clinging to another individual, (3) behaving independently, and (4) behaving in close proximity to mother/adoptive mother. Initially, the adoptee struggled to achieve behavioral profiles consistent with those of the biological infant and normal colobus infants of the same age as he spent significantly more time moving independently and significantly less time clinging to the adoptive mother. After the mysterious death of the biological infant in mid-January 2015, the adoptee assumed a behavioral profile similar to that of infants under normal conditions. This case does not support adaptive hypotheses for adoption (i.e., inclusive fitness or learning to mother). Instead, because the biological infant died, possibly due to the presence of the adoptee, we argue that this case of infant adoption was non-adaptive. Ultimately, this adoption appears to have been an outcome of the adoptee’s persistent desire to be cared for and the female’s strong propensity to engage in allomaternal behavior.

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Acknowledgments

This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. 2012136655, Columbus Zoo and Aquarium, Nacey Maggioncalda Foundation, National Geographic Society, and Pittsburgh Zoo & PPG Aquarium. We recognize the Kenya Wildlife Society for permission to conduct this research. Thanks to Pam Cunneyworth and Andrea Donaldson of Colobus Conservation for providing logistical support for this study. We thank Dr. Ikki Matsuda and one anonymous reviewer for their comments on earlier versions of this manuscript.

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  1. Department of Anthropology, The Ohio State University, Columbus, OH, USA

    Noah Thomas Dunham

  2. Department of Conservation Biology, University of Eastern Africa, Baraton, Kenya

    Paul Otieno Opere

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  1. Noah Thomas Dunham
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Correspondence to Noah Thomas Dunham.

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Dunham, N.T., Opere, P.O. A unique case of extra-group infant adoption in free-ranging Angola black and white colobus monkeys (Colobus angolensis palliatus). Primates 57, 187–194 (2016). https://doi.org/10.1007/s10329-016-0515-5

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