Infant development of Sichuan golden monkey (Rhinopithecus roxellana) in Nagoya Higashiyama Zoo

概要

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In Nagoya Higashiyama Zoo, a female Sichuan Golden Monkey (Rhinopithecus roxellana) was born on April 29, 2009. Behavioral development of the infant was recorded for the first 9 months of the infant's life. One-hundred eight hours of behavioral data were collected using the one-zero and scan sampling. On day 10, the infant broke contact with her mother for the first time, and was capable of climbing up and down the trees on day 53. She started to show interest in solid food, such as mulberry leaf or cabbage, and engaged in play with her sister on day 60. After 60 days of age, the infant spent more time with her sister, suggesting the presence of siblings might affect infant behavioral development. After 6 months of age, the scores of some behaviors, "on belly," "groomed," "in contact," "approach," "proximity" and "leave," reached a plateau, seeming to signal that the infant's development had come to an end. Although the process of behavioral development of the infant in Higashiyama zoo was similar to results at Yuhuangmiao Zhouzhi National Nature Reserve Shaanxi, China, some of the behaviors, such as "show interest in solid food" and "play," were observed at an earlier age than in those reports.