Abstract
Many primates show responses to dead infants, yet testing explanations for these behaviors has been difficult. Callitrichids present a unique opportunity to delineate between hypotheses, since unlike most species, male caretakers form closer social bonds with infants than mothers. Callitrichids are also known to commit infanticide, leaving obvious wounds that may enable them to more readily recognize death. We present: (1) a case study of a wild common marmoset (Callithrix jacchus) group responding to an infant’s natural death, and (2) a review of published infant deaths across callitrichids (N = 16), testing for trends in the sex of reacting individuals and cause of death. In our case study, several group members frequently interacted with the dead infant, attempting to carry it. However, the strongest response was from a male that remained with the corpse for ~ 3 h, despite his group leaving the area. Across callitrichid species, corpse interactions were significantly sex-biased: 100% (N = 6) of accidental deaths involved corpse interaction by males (p = 0.007), compared to 60% (N = 3 of 5) by females (p = 0.095). Cause of death also played a significant role, with individuals attempting to carry dead infants in 100% (N = 6) of accidental deaths, but only 11.1% (N = 1 of 9) of infanticides (p = 0.001). Although the available literature is small and potentially subject to publication biases, these data support the idea that visually obvious wounds may influence callitrichids’ perception of dead conspecifics. Additionally, male-biased patterns of corpse interaction in callitrichids indicate that social bonds likely shape reactions to the dead, in addition to kinship. While published data on primate thanatology are limited, this study demonstrates quantitative approaches that can provide empirical insights into primates’ responses to dead conspecifics.
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Acknowledgements
We would like to thank J.R. de Albuquerque, P.A. Cescon, G.A. Galvão, Y.C. de Lima, I.M. das Neves, A.C.S. Santiago, M.B. Santino, J.M. da Silva, L.M. da Silva Jr., and the Tapacurá field station staff for their help. We also appreciate the constructive feedback from two anonymous reviewers. This work was supported by the National Science Foundation [Behavioral and Cognitive Sciences-1561055] and the Arnold & Mable Beckman Foundation [Beckman Scholars Award-GVSU 2017].
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Thompson, C.L., Hrit, R., Melo, L.C.O. et al. Callitrichid responses to dead and dying infants: the effects of paternal bonding and cause of death. Primates 61, 707–716 (2020). https://doi.org/10.1007/s10329-020-00824-3
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DOI: https://doi.org/10.1007/s10329-020-00824-3