Indonesia is experiencing widespread wildfires that have intensified due to El Niño-driven drought conditions, creating a humanitarian and ecological crisis centered on the nation’s endangered primate populations. The blazes have spread across Sumatra, Kalimantan, and Papua, affecting peatlands that are particularly difficult to extinguish because previous drainage by industrial agriculture has left them highly flammable. According to the International Union for Conservation of Nature, approximately 52% of the total Bornean orangutan population lives in habitats now affected by the fires, prompting urgent calls for international assistance.
The destruction extends beyond orangutans to other vulnerable species. Five gibbon species, all listed as endangered, face habitat loss from the blazes. Additionally, around 4,500 fires have been detected across 21 Sumatran elephant habitats in recent months. Rescue organizations including Yiari have evacuated more than 20 orangutans and other animals such as pangolins from the burning forests, using tranquilizer darts and nets to safely extract animals from trees. However, one rescued orangutan died, likely from smoke inhalation, and many others show signs of injury, dehydration, and malnutrition.
Beyond immediate threats from flames, surviving animals face severe long-term consequences. The extended drought—lasting 80 days without rain in some areas—has depleted food sources as forests struggle to recover. Research indicates that heavy smoke exposure causes physiological stress in orangutans, including ketosis and reduced vocalizations, effects that can persist for months after smoke clears. Gibbons, which depend on singing for mating and territorial defense, similarly show reduced vocal activity under heavy smoke exposure.
Forestry officials indicate that fires could continue until early November, when the rainy season is expected to arrive later than usual. An estimated 600,000 hectares were damaged by fire in August alone. Experts warn that forest recovery takes years, with tree diversity in burned peatlands potentially remaining suppressed for over a decade. If fires recur before ecosystems fully recover, forests risk becoming permanently degraded, with long-term health impacts on surviving animal populations comparable to documented effects of air pollution exposure in humans.
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