Do you remember Esa and Indri, the two rescued baby orangutans who arrived together at Samboja Lestari in mid-2025? Both have now completed their quarantine period and joined the Nursery Group stage of Forest School. How... View Article
The Nyaru Menteng Orangutan Rehabilitation Centre has recently welcomed a new arrival—a tiny female orangutan named Pororo. Arrival at Nyaru Menteng A local resident who voluntarily handed over Pororo reported that she was found on a... View Article
The Ministry of Forestry of the Republic of Indonesia, the Central Kalimantan Natural Resources Conservation Agency, the Bukit Baka Bukit Raya National Park, and the Borneo Orangutan Survival (BOS) Foundation will soon conduct the 46th orangutan... View Article
Do you remember Kopral, the orangutan with no arms? He is our superhero when it comes to determination, resilience and a positive attitude. Last year, he seriously injured his right foot, which is extremely tragic for... View Article
At the BOS Foundation’s rehabilitation centres, the veterinarians perform routine annual health checks to ensure the well-being of the orangutans in our care. Recently, our medical, animal welfare and technician teams at Samboja Lestari conducted a... View Article
Josie is one of the female orangutans currently honing her learned skills on Kaja Pre-Release Island. She is typically shy and solitary, rarely interacting or socialising with other orangutans on the island. Discover how she has... View Article
Since 29 May 2025, Selfie, a young female orangutan, has officially joined the small group at the Forest School of the Nyaru Menteng Rehabilitation Centre. Initially, she was accompanied by her little friend Rumba, who brought... View Article
Do you remember Sie-Sie, the orangutan who was released into the wild last April? Unlike most orangutans who immediately climb trees or quietly distance themselves after release, Sie-Sie reacted with aggression. He showed signs of stress... View Article
Mating behaviour is one of the most important forms of social interaction in the life of orangutans. This interaction occurs between male and female individuals and plays a vital role in ensuring the survival of a... View Article
In the wild, baby orangutans, like Signe’s son Rafalang, remain closely attached to their mothers until they are around 7 to 8 years old. During this long period, a female orangutan will not give birth again,... View Article
In the vast wilderness of Bukit Baka Bukit Raya National Park, Central Kalimantan, the story of Suci, a young female orangutan, continues to unfold with new wonders. First released in 2021, Suci occasionally appeared during observations... View Article
Wildlife monitoring technology has evolved significantly in recent years, with camera traps being one example. Since 2024, the PT. Restorasi Habitat Orangutan Indonesia (PT. RHOI) team has installed six Reconyx Hyperfire infrared cameras in the Kehje... View Article
In the heart of the Hiran Watershed area within the Bukit Baka Bukit Raya National Park in Central Kalimantan, an unexpected encounter between a mother orangutan and her baby filled the BOS Post-Release Monitoring team with... View Article
As part of ongoing efforts to protect the Kehje Sewen Forest in East Kalimantan, the Community Development Team and the Ecosystem Restoration – Forest Protection, Security, and Fire Prevention (RE-PPHK) Team from BOS Foundation’s company PT... View Article
Nestled in East Kalimantan, the Kehje Sewen Forest is a tropical treasure trove—rich in both biotic and abiotic resources that make it a globally significant ecosystem. Home to a wide variety of plant and animal species,... View Article
Jumbo was the fifth orangutan released by the BOS team into the Bukit Baka Bukit Raya National Park in Central Kalimantan. He followed Hanau, Pirang, Rongda, and Radmala, who were released prior. These five orangutans were... View Article
Recently, the Samboja Lestari Rehabilitation Centre welcomed a new female sun bear cub. The BOS team, consisting of a veterinarian and the animal welfare and communications team, travelled to the Natural Resources Conservation Agency’s Tenggarong office... View Article
Jumbo is about to experience his well-deserved freedom in the Bukit Baka Bukit Raya National Park as part of the upcoming release from the Nyaru Menteng Rehabilitation Centre. Before that happens, let’s take a moment to... View Article
The Ministry of Forestry of the Republic of Indonesia, the Central Kalimantan Natural Resources Conservation Agency and the Borneo BOS Foundation will soon conduct the 45th orangutan release from the Nyaru Menteng Rehabilitation Centre to Bukit... View Article
In the large group at Forest School, seven young orangutans actively play and learn together under the watchful care of our experienced surrogate mothers. It has been two months since these orphans moved to the site... View Article
At the end of 2024, Baimah and Feruza advanced to Forest School Level 1. Their journey to this new stage of their rehabilitation journey began with an adaptation process full of challenges. When Baimah arrived at... View Article
April 23, 2025, marked a historic moment in Indonesia’s orangutan conservation efforts. The Ministry of Forestry of the Republic of Indonesia, the East Kalimantan Natural Resources Conservation Agency (BKSDA), and the Borneo Orangutan Survival (BOS) Foundation,... View Article
The Ministry of Forestry of the Republic of Indonesia, the Natural Resources Conservation Agency (BKSDA) of East Kalimantan, and the Borneo Orangutan Survival (BOS) Foundation—with support from Riau Andalan Pulp and Paper (RAPP)—are preparing for the... View Article
Our Post-Release Monitoring (PRM) team in the southern section of the Kehje Sewen Forest recently had another encounter with Signe and her baby. The infant now has a name: Rafalang, which is a combination of the... View Article
In late 2024, Yuyun’s health took a significant turn for the worse. On Island #0, where she had lived with her fellow orangutan Jeffrey for a long time, Yuyun appeared weak and had lost her appetite.... View Article
Welcome to another thrilling day at the Nyaru Menteng Forest School! Today, we’re hanging out with our favourite cheeky orangutans—Paulinus, Bumi, and their playful pals—for some epic fun with fresh-cut grass! The youngsters stumbled upon a... View Article
Our Post-Release Monitoring (PRM) team recently spotted a familiar face in the Bukit Batikap Protection Forest. After being untracked for several years since her release in 2015, the female orangutan Mentos was finally identified again. Even... View Article
In addition to 116 orangutans, our Samboja Lestari Centre currently accommodates 76 sun bears. Many of them are orphaned cubs who need nursery care and go to Forest School, similar to our orangutans. “Sun bear cubs... View Article
Patrick Rouxel serves as a consultant for the BOS Foundation’s Sun Bear Program. His unwavering passion and commitment to improving the facilities of the sun bears at Samboja Lestari are essential to their well-being. What inspired... View Article
BOS supports not only orangutans and sun bears but also the indigenous communities living in and around the forests of Kalimantan. We proudly uphold their traditions, such as the Hudoq Festival of the Dayak people, passed... View Article
Orangutans go to the dentist, too. Our veterinarians handle everything from serious adult procedures to playful check-ups for young ones. Recently, Herkules wasn’t feeling well. He was suffering from cavities and a fractured root tooth, which... View Article
We have recently welcomed a new infant orangutan at the Samboja Lestari Rehabilitation Centre. Little Jenny’s rescue story began when a villager found her alone on an oil palm plantation. Believing she was a macaque, he... View Article
At the end of last year, sweet Meryl embarked on her new life in Bukit Baka Bukit Raya National Park. Despite experiencing stress during the journey, Meryl quickly adapted to her new environment. Her journey symbolises... View Article
Reuniting with rehabilitated orangutans always brings unique stories for our Post-Release Monitoring (PRM) teams at release sites. Here is one from the Kehje Sewen Forest. It was a bright morning when the PRM team members went... View Article
Do you remember the story of Hamzah crashing Lesan and Sayang’s party? It’s been two years since orangutan Sayang and her baby, along with Lesan and her offspring, last celebrated at Camp Lesik. Recently, they returned... View Article
Temon, a 3-year-old female orangutan, and Lahei, a 4-year-old male, are skilled and independent explorers from the large Forest School group at the Nyaru Menteng Rehabilitation Centre. Recently, they kept our surrogate mothers on their toes... View Article
