Abstract
Marmosets and tamarins are characterized by a reproductive strategy that includes twinning, and a communal rearing system in which infant care is shared among all group members, both breeders and nonbreeding helpers (often older offspring). In order to test some predictions about the extent to which different age-sex classes should invest in infants, contributions to infant carrying and food-sharing by all family members were measured in captive groups of cotton-top tamarins (Saquinus oedipus) ranging in size from 2 to 12 independent individuals. Fourteen litters were observed from birth to 12 weeks. Carrying by mothers decreased steadily over the study period, while carrying by fathers and other offspring increased for 3–5 weeks, then declined. Infants spent more time carried by siblings than by either parent, but parents did more carrying than individual siblings and, also, shared more food with infants. Older siblings contributed more care than younger siblings did. Adult sons carried infants more than adult daughters did, but immature daughters carried more than immature sons did. However, adult daughters actively offered food to infants more than any other class of helper did. These results were interpreted in the light of hypotheses concerning the reproductive and dispersal strategies of callitrichid species.
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Price, E.C. Contributions to infant care in captive cotton-top tamarins (Saguinus oedipus): The influence of age, sex, and reproductive status. International Journal of Primatology 13, 125–141 (1992). https://doi.org/10.1007/BF02547838
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DOI: https://doi.org/10.1007/BF02547838