Wildfires spreading across Indonesia’s Sumatra, Kalimantan, and Papua regions are severely impacting primate populations and other wildlife species. Specialists from the International Union for Conservation of Nature have warned that thousands of orangutans face potential death, injury, or displacement as blazes consume forests and peatland across the Indonesian archipelago. The fires have affected habitat containing approximately 52% of the total Bornean orangutan population, while also threatening five endangered gibbon species and elephant habitats across Sumatra.
The crisis has been exacerbated by El Niño-driven drought conditions that have intensified the fires’ spread and severity. Indonesia experiences annual wildfires as land is cleared for agricultural purposes, but current conditions have proven especially destructive. Peatland areas, which should remain waterlogged in their natural state, have been drained by industrial agriculture over decades and now burn intensely, smoldering underground and proving extremely difficult to extinguish. An estimated 600,000 hectares of land were damaged by fire in August alone, with fires potentially continuing into early November as the rainy season arrives later than expected.
Rescue efforts have extracted more than 20 orangutans from affected areas, with the work conducted by conservation organizations in coordination with local authorities. Rescued animals frequently present with severe dehydration, malnutrition, and burn injuries from walking on scorched ground. One rescued orangutan died, likely from smoke inhalation. Extraction operations involve teams using sedative darts fired into trees, with nets positioned to catch animals as they fall, representing a last-resort intervention undertaken only when forest destruction makes survival unlikely.
Surviving animals face compounding challenges beyond immediate fire danger. Food availability declines significantly as forests struggle to recover, and prolonged smoke exposure triggers physiological stress responses including increased fat breakdown. Research indicates that long-term forest recovery requires years, with tree diversity in burned peatlands remaining suppressed for extended periods. If fires recur before forests fully recover, ecosystems risk becoming permanently degraded. Additionally, studies from previous fire events have documented health impacts including altered vocalizations in primates and respiratory effects comparable to those observed in humans exposed to extended smog.
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