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Do you remember the moment when orangutans were moved from the socialization complex to the sanctuary islands at the Samboja Lestari Rehabilitation Centre? One of the individuals relocated was Jujun, a male orangutan who is now beginning his semi-wild life on Sanctuary Island #5.

Jujun’s Positive Adaptation on Sanctuary Island #5

Since settling on the sanctuary island, Jujun’s development has shown very encouraging progress. He has been observed to be active and highly curious about his new environment. Although he still spends a considerable amount of time on the ground rather than in the forest canopy, Jujun has explored almost the entire island area.

See more: Video: Amazing Yuyun Moves to an Island

This behavior reflects his strong adaptability and growing confidence over time. Such intensive exploration is also an important part of the adjustment process for unreleaseable orangutans or the individuals who cannot be returned to the wild as they adapt to a semi-natural habitat.

Exploratory Behavior and Physical Development

During his exploration, Jujun has also displayed mild destructive behavior, which is still considered normal for an orangutan of his age. Monitoring records show that two ironwood (ulin) poles used as rope connectors were damaged after being broken by Jujun.

This behavior indicates the development of his increasing physical strength and forms part of his learning process as he becomes familiar with the structures within his island environment.

Feeding Behavior and Social Interaction with Vera

In terms of feeding, Jujun has shown a very healthy appetite. On several occasions, he was observed taking Vera’s food when she had not yet finished her portion. However, these interactions were not accompanied by aggressive behavior.

Read more: Yuyun’s Journey to Recovery

Throughout the observation period, Jujun did not display any signs of attacking, biting, or risky dominant behaviour. Social interactions between Jujun and Vera have remained within safe and natural boundaries. Jujun has demonstrated passive dominance without physical aggression, indicating relatively stable social behavior development.

Ongoing Evaluation and Monitoring

Overall, Jujun has shown very positive development in terms of physical condition, exploratory behavior, and social interaction. Nevertheless, continued monitoring remains essential to ensure that mild destructive behavior and food competition can be managed appropriately as his adaptation process continues.

Jujun’s journey on Sanctuary Island #5 reflects our ongoing commitment to improving the quality of life for unreleaseable orangutans, while also giving them a second chance to live a life that is closer to their natural way of being.

Date Posted: March 6, 2026
Text by: BOS Foundation Communications Team at Samboja Lestari, East Kalimantan

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