Borneo Orangutan Survival Foundation




Powering on with our 2017 #OrangutanFreedom campaign, the BOS Foundation through the East Kalimantan Orangutan Reintroduction Program in Samboja Lestari (Samboja Lestari) and the East Kalimantan BKSDA will release six more orangutans to the Kehje Sewen Forest in East Kutai Regency. Here are the release candidates' profiles



Justin was rescued by the Tenggarong BKSDA from a local villager in Kota Bangun, Kutai Kartanegara Regency, East Kalimantan, who claimed to have found him stranded near his field. Justin was brought to Samboja Lestari on October 17, 2010, when he was just three years old. At the time he was in good health, but feared humans.

After completing quarantine, Justin began his rehabilitation in Forest School Level 2. He has gradually become more independent and is good at identifying natural food sources. He is able to make sturdy nests and now prefers to stay overnight in Forest School.

Justin is now 10 years old and weighs 33 kilograms. With a good set of survival skills, Justin is ready to live in the wild habitat of the Kehje Sewen Forest.

2. UNG


Ung was rescued by the Tenggarong BKSDA from a local villager, and arrived at Samboja Lestari on April 5, 2010, when she was five years old. 

Following a period of quarantine, Ung entered rehabilitation in Forest School Level 2 where she has became a skilled forager and nest builder. In 2012, Ung moved to Forest School Level 3, where she grew to become even more independent.

Ung is now 12 years old and weighs 41 kilograms. After seven years of rehabilitation at Samboja Lestari, Ung will soon be free in Kehje Sewen Forest.



Robert was confiscated by the Tenggarong BKSDA from a villager in Muara Wahau, East Kalimantan, who was keeping him illegally as a pet. Robert came to Samboja Lestari on July 18, 2010, when he was two years old. At the time he still exhibited some wild behaviour, and behaved aggressively towards babysitters whenever they approached him.

Clever Robert moved from Nursery Group directly to Forest School Level 2. He was the youngest in the group at that time, but readily understood instructions. In 2014, Robert was moved to Island 4 in Samboja Lestari. Robert has since grown into a dominant male who likes to spend time alone. He is a good forager and spends a great amount of time up in the trees.

Now 9 years old and weighing 40 kilograms, Robert is ready to return home to the Kehje Sewen Forest.



Reckie was rescued by the Tenggarong BKSDA from the Samarinda Botanical Garden, a local tourism location in East Kalimantan. She came to Samboja Lestari on April 5, 2010, when she was a little 1-year-old.

Reckie started her rehabilitation in the Nursery Group and gradually moved through Forest School Levels 1, 2 and 3. Now an independent female with good foraging and nest-building skills, Reckie loves to spend most of her time up in the trees.

Reckie is now eight years old and weighs 30 kilograms. After seven years in the rehabilitation centre, she will soon return to a life of freedom exploring the Kehje Sewen Forest.



A mining company in Bengalon, East Kalimantan, handed over an eight-month-old female named Tree to Samboja Lestari on August 25, 2006.

Thanks to the loving care and attention from our dedicated babysitters, Tree has become an ideal release candidate. She spends most of her time alone up in the trees and avoids interaction with humans; even becoming agitated when she sees humans approach. Tree is quite a dominant figure in Forest School, and other orangutans respect her.

Now 11 years old and weighing 27 kilograms, Tree is ready to live independently in the wilds of the Kehje Sewen Forest.



Heli was confiscated by local authorities from a local villager in Sangatta, who claimed to have found her in a plantation: The villager claimed she had fallen from a tree and became separated from her mother, who was chased off by a dog. Heli came to Samboja Lestari in good health on November 26, 2008, when she was about one year old.

During her time in Forest School, Heli became known for her sound social skills: She liked to teach younger orangutans how to do things. Heli is good friends with Reckie, who is also a release candidate, and the two spend much of their time together.

Now 10 years old and weighing 34 kilograms, Heli is ready to live in a wild forest such as the Kehje Sewen.


Earth Day with BCU Students

Nyaru Menteng staff, together with students and teachers from Bina Cita Utama (BCU) School in Palangka Raya, Central Kalimantan, celebrated Earth Day 2017

Read More

BOSF Media Channel