Gibbon's Bridge: Ape Uses Canopy Crossing in Assam

The first instance globally of a Western hoolock gibbon using an artificial canopy bridge over a railway line has been recorded in Assam's Hollongapar Gibbon Sanctuary. This event offers cautious optimism for the survival of India's only ape species.

The Lumding-Dibrugarh railway line passes through the sanctuary, which is home to an estimated 120-130 individuals. Artificial canopy bridges are designed to reconnect fragmented forest patches, aiding arboreal species that rely on continuous tree cover for movement and foraging.

Following consultations in 2022, five double-rope canopy bridges were installed. In February-March of this year, a male gibbon was observed using one of these crossings, just months after their installation.

Globally, artificial canopy bridges are used to mitigate habitat fragmentation caused by infrastructure like roads and railways. However, conservationists caution that these structures address symptoms rather than causes. They can make wildlife predictable, increasing predation risk, and may not be sufficient for genetic viability without significant habitat restoration.

The Wildlife Institute of India highlighted this as a landmark moment for gibbon conservation but stressed that long-term solutions like careful infrastructure planning and reforestation corridors are critical for the survival of exclusively arboreal and threatened species.