Development of infant twin Japanese monkeys (Macaca fuscata) in a free-ranging group

Primates ◽  
1983 ◽  
Vol 24 (4) ◽  
pp. 576-583 ◽  
Author(s):  
Masayuki Nakamichi
Keyword(s):  
Macaca Fuscata ◽  
Japanese Monkeys ◽  
Free Ranging

Continuity of Affiliative Relationships among Infants and Juveniles in a Free-Ranging Group of Japanese Monkeys (Macaca Fuscata)

1998 ◽  
Vol 82 (2) ◽  
pp. 691-700
Author(s):  
Yasuo Kojima
Keyword(s):  
Macaca Fuscata ◽  
Early Stage ◽  
First Year ◽  
Japanese Monkeys ◽  
Stage Of Development ◽  
Free Ranging ◽  
Selection Of

5 infants were observed during the first 13 mo. after birth in a free-ranging group of Japanese monkeys ( Macaco fuscata) to examine whether they maintained relatively frequent affiliative relationships with particular immature individuals. The number of immature affiliative partners rapidly increased from the first 3-mo. period after birth to the second 4-mo. period after birth, and the infants thereafter maintained affiliative relationships with particular individuals, mostly same-aged infants, at least in the second half of their first year. These findings show that infants were likely to interact with a larger number of different animals in the early stage of development, and thereafter selected particular individuals with whom they maintained affiliative relationships. The effects of sex on the selection of these long-term partners are also discussed.

Old grandmothers provide essential care to their young granddaughters in a free-ranging group of Japanese monkeys (Macaca fuscata)

Primates ◽  
2009 ◽  
Vol 51 (2) ◽  
pp. 171-174 ◽  
Author(s):  
Masayuki Nakamichi ◽  
Kenji Onishi ◽  
Kazunori Yamada
Keyword(s):  
Macaca Fuscata ◽  
Japanese Monkeys ◽  
Free Ranging
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