Archives: November 2015

New Camp in South of Kehje Sewen

November 10, 2015. Posted in Article

To support our orangutan reintrodution program in East Kalimantan, the BOS Foundation and PT RHOI (Restorasi Habitat Orangutan Indonesia) built a new camp in the southern part of Kehje Sewen Forest to ensure we can properly monitor the newly reintroduced orangutans in this area. One post-release monitoring team is stationed here and deployed daily to observe the progress and adaptation of our released orangutans.

This new camp is called Nles Mamse and construction started in August 2015. The name Nles Mamse was given by the local Wehean Dayak tribe. Whilst under construction, the PRM team were living in a flying (temporary) camp so we could still adequately monitor the orangutans we reintroduced in September.


Despite living under a temporary roof, the PRM team made the camp as cozy as possible. They maintained the basic hut there, and also renovated the trail heading towards the release points. This trail was formerly a track used by a logging company working in the Kehje Sewen area. Since it had been abandoned for many years, it was completely covered with new secondary vegetation.

Prior to the release day on September 4th, the field team worked hard to fix and clear the trail of wooden stumps and boulders. The team had to make sure the track was clear of obstacles that might damage our 4-wheel drive pickup truck which was needed to transport the orangutans themselvs and logistics to support the team.


On the August 31, the almost finished Nles Mamse camp was inaugurated. The Head of RHOI’s Operational and Planning Bureau, Ariyo Sambodo who led the advance team and had the responsibility of preparing the camp and the release points, gave a speech to the team.

“We hope our new Nles Mamse camp will be a comfortable place to live on and bring happiness to our colleagues conducting post-release monitoring in South Kehje Sewen,” said Ariyo.


The inauguration was a great success and thanks to our two camp chefs, Mbak Sri and Mbak Sum, everyone thoroughly enjoyed the excellent meal. Not surprising when you consider the exhausting daily activities that the team experiences in the forest.

With new infrastructure in place, refresher trainings were implemented by our BMP (Best Management Practice) Specialist, Eko Prasetyo to ensure that our new PRM team members were properly trained in all areas of post-release monitoring; from GPS and radio tracking use to orangutan behaviour. This knowledge was strengthened with training on tree species identification which is needed for phenology surveys and to record what the orangutans are eating. This training is instrumental for recording accurate data.

pageNles Mamse camp is now up and running. This building is equipped with solar panels for light during the night, and to support the PRM team collecting monitoring data on Ajeng, Long, Arief, Leonie and Erica who we released in September.

catsWe hope this camp serves as a happy place of work for our orangutan warriors in southern Kehje Sewen Forest.

Text by: BOSF-RHOI Communication Team

You can support our team and its monitoring activities too. Donate now to the BOS Foundation and keep our spirits high!

Yayang and Her Healthy Children

November 3, 2015. Posted in Article

It had been a while since we had observed Yayang and her family, so the PRM team in the northern part of the Kehje Sewen Forest dedicated several days to collect observational data on these three orangutans. Before leaving Camp Lesik the team tried to locate Yayang using a radio telemetry, which indicates a signal once it detects the individual orangutan’s transmission.

patroli yayang by rusda

After hours of combing the forest, the team – Arif, Rizal and Ilham – were unable to pick up a strong signal from Yayang’s transmitter and therefore couldn’t locate her position.

However, at around 2 p.m., the team at Camp Lesik spotted Yayang roaming around the camp. They quickly took the opportunity to observe Yayang, whilst Arif, Rizal and Ilham, who were still in the forest, continued to patrol for another orangutan’s signals.

Yayang and her clinging baby were observed spending most of their time in the trees, occasionally climbing down to pluck shoots. Sayang, who was several-hundred meters away, was observed doing her own thing and resting.



sayang by handoko

In the late afternoon, Yayang returned to the Kehje Sewen forest, while Sayang made her nest not far from the camp.

It was lovely to see Yayang, Sayang and the baby in good health and all doing very well. Yayang has proven herself a good mother to her two children, and it is a joy to witness Sayang’s progress as she matures into an active and independent soul in the Kehje Sewen Forest.

Text by: PRM team in Camp Lesik, Kehje Sewen Forest

You can support our team and its monitoring activities too. Donate now to the BOS Foundation and keep our spirits high!