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  • Title: Male care in a free-ranging group of Japanese macaques (Macaca fuscata).
    Author: Nakamichi M, Ueno M, Yamada K.
    Journal: Primates; 2021 Nov; 62(6):971-980. PubMed ID: 34546459.
    Abstract:
    Among the Macaca species, adult male Japanese macaques are the least likely to perform male care (i.e., affiliative interactions between adult males and immatures, including holding, carrying, and grooming); however, they perform male care for infants, albeit infrequently. We examined 17 cases of male care observed for the first time when the immature was younger than 1 year of age. Eleven of the 31 adult males who remained as central males during the 30-year observation period performed male care. Their age and dominance rank did not influence the occurrence of male care. Most cases were first recorded between the last part of the mating season and the first part of the birth season (January-March), whereas male care was rarely observed during the mating season (October-December). In 12 of the 17 cases, male care ceased within 6 months after the first observation, whereas in the remaining cases, it continued for at least 1 year. In 15 of the 17 cases, males tended to perform male care for matrilineally unrelated female infants of low-ranking mothers. In some cases, the male and infant mother showed grooming interactions for 6 months both before and after the start of male care, whereas such grooming interactions were never recorded either before or after the start of male care in other cases. We also examined some hypotheses on male-immature associations and the probable benefits that males and infants might acquire through male care.
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