Orangutan Milestone: Use of a Canopy Bridge in Sumatra

In April 2026, camera traps captured a young male Sumatran orangutan (Pongo abelii) crossing a rope-suspended canopy bridge over the Lagan-Pagindar road in Pakpak Bharat, North Sumatra. The footage marks the first documented use of a purpose-built wildlife crossing by the species.

The Guardian

The Lagan-Pagindar road, upgraded in 2023, widened the canopy gap, turning the highway into a barrier for arboreal fauna. It split the local orangutan population between the Siranggas wildlife reserve and the Sikulaping protection forest, isolating about 350 individuals and raising the risk of inbreeding and extinction.

Conservation Milestone: Sumatran Orangutan Filmed Using Canopy Bridge

The bridge was installed in 2024 by the Sumatran Orangutan Society (SOS) and Indonesian NGO Tangguh Hutan Khatulistiwa (TaHuKah). Local government support came from Franc Bernhard Tumanggor, head (Bupati) of Pakpak Bharat. Coordination was led by Helen Buckland, SOS chief executive, and Erwin Alamsyah Siregar, TaHuKah director.

"We have watched and waited for this moment." World-first footage shows orangutan using canopy bridge to cross a road in North Sumatra

• Local orangutan count: ~350; global estimate: ~14,000.

The Guardian

• Bridge: ~10 m long, built with 200 m rope; five bridges installed in 4–5 days.

"We have watched and waited for this moment." World-first footage shows orangutan using canopy bridge to cross a road in North Sumatra

• Before orangutan crossing, the structure was used by black giant squirrels, long-tailed macaques, agile gibbons, black Sumatran langurs and other arboreal mammals.

"We have watched and waited for this moment." World-first footage shows orangutan using canopy bridge to cross a road in North Sumatra

The orangutan approached the bridge, stepped onto the rope, paused midway to view the road, glanced at the camera, then continued into Sikulaping protection forest. This behavior shows the species can adapt to artificial arboreal routes when natural canopy continuity is absent.

Conservation Milestone: Sumatran Orangutan Filmed Using Canopy Bridge

Sumatran orangutans are a keystone species spending over 90 % of time in the canopy. Their slow reproductive rate makes isolated sub-populations vulnerable to genetic bottlenecks. Restoring connectivity via canopy bridges can maintain gene flow, reduce inbreeding risk, and support long-term viability.

Conservation Milestone: Sumatran Orangutan Filmed Using Canopy Bridge

Local authorities said the bridge shows infrastructure can coexist with biodiversity protection. SOS highlighted the event’s emotional significance for the team and bridge’s role in preventing functional extinction. TaHuKah noted the design mimics natural branch tension, suiting arboreal species.

Conservation Milestone: Sumatran Orangutan Filmed Using Canopy Bridge

• “Natural crossing was 'impossible for wildlife',” — Erwin Alamsyah Siregar, director, Tangguh Hutan Khatulistiwa

Sumatran Orangutan Filmed Using Canopy Bridge to Cross Indonesian Road

• “Witnessing a Sumatran orangutan confidently crossing that bridge is living proof that we need not sever the forest’s lifeline in order to build our communities’ own.” — Franc Bernhard Tumanggor, head of Pakpak Bharat district

Sumatran Orangutan Filmed Using Canopy Bridge to Cross Indonesian Road

• “Orangutans have a very slow life history, and are really prone to genetic bottlenecks,” — Helen Buckland, chief executive, Sumatran Orangutan Society

The Guardian

• “Witnessing a Sumatran orangutan confidently crossing that bridge is living proof that we need not sever the forest’s lifeline in order to build our communities’ own. Modernisation does not have to mean destruction.” — Franc Bernhard Tumanggor, head of Pakpak Bharat district

The Guardian

The canopy-bridge model is being studied by conservation groups worldwide as a potential standard for tropical road development.

Conservation Milestone: Sumatran Orangutan Filmed Using Canopy Bridge