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Social grooming in marmosets and humans. (A) A marmoset father is holding an infant (~1 month old) while being groomed by another adult member of the group, as compared to (B) a human parent bathing an infant (1 week old). Marmosets begin social grooming around 16–28 weeks. While not specifically labeled social grooming, humans frequently engage in dyadic activities related to grooming, such as bathing and diapering.
