Four days of heavy rainfall and landslides triggered by Cyclone Senyar smashed Sumatra’s forest landscape, driving an estimated 58 Tapanuli orangutans to death—roughly 7% of the species’ total population.
These numbers are conservative and do not account for canopy damage or loss of food sources that may further starve remaining individuals.
In late November 2025, the storm killed more than 1,000 people and overwhelmed local communities, but wildlife suffered in equal measure. Humanitarian workers found a semi‑buried orangutan carcass in Pulo Pakkat village, a sight that highlighted the brutal nature of the flood.
Professor Erik Meijaard of Borneo Futures, who led the study, had originally estimated 35 deaths, but new evidence suggests 58 fatalities—a significant increase.
Experts note that the extreme rainfall was atypical but driven by climate change, and the frequency of such events is expected to rise, imperiling the Tapanuli orangutan’s already fragile habitat.
Indonesia has temporarily halted major developments in the Batang Toru area—the species’ protected forest—providing a window to assess ecological risks and plan protection measures.
Researchers emphasize that coordinated, large‑scale responses, backed by international funding and climate‑responsive planning, are vital to prevent the first modern extinction of a great ape species.
Continued domestic protection, habitat restoration, and global cooperation are essential for the species’ survival.
