Our Post-Release Monitoring (PRM) team from PT. Restorasi Habitat Orangutan Indonesia (PT. RHOI) in the northern part of Kehje Sewen Forest recently encountered a group of white-fronted langurs (Presbytis frontata) sheltering from the rain. This special moment reaffirms the incredible biodiversity still thriving in Kehje Sewen Forest. The langurs were spotted approximately two kilometers from Lesik Camp.

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White-fronted langurs are known for being shy and elusive primates, making this encounter a rare and exciting experience. The small group was found calmly enjoying the serenity of the forest despite the rain. Our team managed to capture an image of one individual showcasing its distinctive feature—a white forehead, which contrasts with its predominantly dark body.

Getting to Know the White-Fronted Langur

The white-fronted langur (Presbytis frontata) is an endemic primate species found only on the island of Borneo. They are medium-sized primates, with a body length ranging from 40-50 cm. Their long tails provide balance as they leap from one tree to another. Their most distinguishing feature is a white stripe on their forehead, which differentiates them from other langur species.

These primates inhabit lowland to hilly tropical rainforests, relying heavily on dense tree canopies as their primary habitat. White-fronted langurs typically live in small groups of 4-6 individuals, led by a single adult male. Their diet consists mainly of young leaves, fruits, and flowers. They play a crucial ecological role as seed spreaders, helping to maintain forest balance.

Life in Kehje Sewen Forest

Kehje Sewen Forest, with its dense Dipterocarp vegetation, provides an ideal habitat for the white-fronted langur. The rich flora and protection from human disturbances allow these primates to live safely. The presence of white-fronted langurs in our work area also serves as a positive indicator that Kehje Sewen Forest's ecosystem remains healthy.

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However, white-fronted langurs face serious threats, including illegal hunting and habitat loss due to deforestation. According to the IUCN Red List, this species is classified as “Vulnerable”, meaning its population continues to decline in the wild. Protecting habitats like Kehje Sewen Forest is one of the most critical efforts to ensure the survival of this unique primate.

Hope from This Special Encounter

Encountering the white-fronted langurs during routine patrols has renewed our PRM team's spirit. It is not only proof that biodiversity in Kehje Sewen Forest remains intact, but also a powerful reminder of the importance of conservation efforts to protect these animals.

Through continuous monitoring and sustainable protection measures, we hope that Kehje Sewen Forest will remain a safe haven for white-fronted langurs and other wildlife. Their beauty amidst the gentle rain that day symbolizes hope for the preservation of Borneo’s rainforests for generations to come.

Text by: BOS Foundation Communication Team, Central Office, Bogor, West Java