The Hidden Glider of Kalimantan: Meet the Bornean Colugo

Narkata Rimba became the stage for an extraordinary encounter—a glimpse of the Bornean Colugo (Galeopterus borneanus). This elusive mammal, part of the Dermoptera order, is a natural wonder found only on the island of Borneo.

It wasn’t just a single Colugo we encountered, t was an entire family of Bornean Colugos, gliding gracefully through the dense foliage! This sighting adds an extraordinary layer to an already rare experience. While Colugos are typically solitary creatures, with individuals often seen alone except during mother-offspring bonding periods, spotting a group like this is truly remarkable. It could indicate a unique behavioural adaptation or perhaps the abundance of resources in the area. This incredible sighting underscores the importance of conserving Kalimantan’s ecosystems, as they provide the resources and safety necessary to support such fascinating wildlife behaviors.

With a unique gliding ability enabled by its patagium—a membrane stretching from its neck to the tip of its tail and between its limbs—the Bornean Colugo can soar gracefully between trees, making it one of the most efficient mammalian gliders. This nocturnal species, with its large eyes, is well-equipped to navigate the dense forests under the cover of darkness. Males exhibit a reddish-gray hue, while females display a moss-like or bark-like coloration, providing exceptional camouflage that allows them to blend seamlessly into the bark and foliage of their tropical habitat.

As a herbivore, the Bornean Colugo has a specialized digestive system capable of breaking down fibrous plant material with the help of microorganisms. This unique diet plays a crucial ecological role by aiding in seed dispersal and maintaining the delicate balance of the forest’s vegetation.

However, this remarkable species faces challenges. The Bornean Colugo is listed under Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), ensuring its trade is closely regulated to prevent population decline. In Indonesia, it is also protected under Law No. 5 of 1990 on Conservation of Natural Resources and Ecosystems.

For the Nusantara Climate Initiative (NCI), this encounter underscores the importance of conserving Kalimantan’s ecosystems. As part of our mission to develop Nature-Based Solutions (NBS), NCI is committed to protecting biodiversity, including species like the Bornean Colugo. This aligns with our goal to ensure ecological balance while supporting climate resilience.

Through conservation efforts at sites like Narkata Rimba, NCI aims to safeguard these ecosystems and the unique species that depend on them. Encounters like this remind us why our work matters—each species is a vital thread in the web of life, and protecting them ensures the sustainability of our planet for generations to come. Conservation is a journey we take together. Let’s collaborate to ensure a thriving future for Kalimantan’s forests and its remarkable species.

Author: Adhy Maruly

Copy Edit: Yessi Agustina; Barakalla Robyn

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