A Sumatran orangutan has been filmed for the first time using a human-made canopy bridge to cross a public road on the Indonesian island of Sumatra, conservationists announced Monday.
- First Documentation: This is the first recorded instance of a Sumatran orangutan using an artificial canopy bridge to cross a public road.
- Habitat Connectivity: The bridges reconnect the Siranggas Wildlife Reserve and the Sikulaping Protection Forest.
- Population Risk: Fewer than 14,000 Sumatran orangutans remain in the wild, making genetic connectivity critical for survival.
The crossing was captured by a motion-sensitive camera, showing a young orangutan cautiously gripping a rope and stepping into the open air. After pausing halfway to look at the road below, the animal completed the crossing.
Connecting Fragmented Habitats
The bridge spans the Lagan–Pagindar road in the Pakpak Bharat district. While the road is a vital corridor for local communities to access healthcare and education, it splits the habitat of an estimated 350 orangutans.
When the road was upgraded in 2024, the gap in the forest canopy widened, removing natural crossing points for tree-dwelling wildlife. Conservationists noted that without intervention, the orangutans would have remained trapped on either side of the road.
To solve this, the conservation group Tangguh Hutan Khatulistiwa (TaHuKah), the Sumatran Orangutan Society (SOS), and government agencies installed five rope bridges. These structures were specifically designed to support the weight of the world’s largest tree-dwelling mammal.
A Two-Year Waiting Period
Conservationists waited two years for an orangutan to utilize the structures. During that time, camera traps recorded squirrels, langur monkeys, macaques, and gibbons using the bridges.
Erwin Alamsyah Siregar, executive director of TaHuKah, explained that orangutans are cautious observers who test ropes and build nests near the edges before committing to a crossing.
While similar bridges have been used by orangutans over rivers or private industrial roads, the noise and unpredictability of public roads present a significantly greater challenge for the species.
Combatting Extinction
The initiative aims to prevent inbreeding and genetic weakening caused by population isolation. Maintaining the ability for these animals to move and mix is considered essential to reducing the risk of extinction.
Currently, orangutans survive only on the islands of Sumatra and Borneo. In addition to the fewer than 14,000 Sumatran orangutans, there are approximately 800 Tapanuli orangutans and 104,700 Bornean orangutans remaining in the wild.
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