Each year on 19 August, World Orangutan Day shines a spotlight on one of the planet’s most intelligent primates — and their rapidly vanishing rainforest homes.
Image used for illustrative purposes/Simone Dinoia/Unsplash
Despite decades of research into their complex behaviour and human-like intelligence, orangutans remain critically endangered in the forests of Borneo and Sumatra, the only two regions where they naturally occur, according to Mongabay reports.
The world’s most endangered great ape
In June, Mongabay founder Rhett Butler highlighted a new report, Primates in Peril: The World’s 25 Most Endangered Primates. Among the species listed is the Tapanuli orangutan (Pongo tapanuliensis), the rarest great ape on Earth.
Before the Tapanuli was formally described in 2017, only two species of orangutans were recognised: the Sumatran (Pongo abelii) and Bornean (Pongo pygmaeus) orangutans.
According to the report, “high levels of habitat conversion and fragmentation, along with illegal hunting and poaching” have caused an “extensive population decline” in Tapanuli orangutans over the past 150 years, leaving just around 700 individuals in Indonesia’s Batang Toru Forest.
Rainforests under pressure
Habitat destruction remains the greatest threat to orangutans.
- In March, Mongabay’s Hans Nicholas Jong reported on potential mining expansion in Batang Toru, which is the only known habitat of the Tapanuli orangutan. Almost 200,000 people signed a petition opposing the development of hundreds of hectares of this forest.
- In January, Jong also revealed that illegal deforestation for palm oil plantations in Sumatra has risen to record levels, threatening even protected areas like the Rawa Singkil Wildlife Reserve, a UNESCO World Heritage Site that shelters Sumatran orangutans.
- In Borneo, companies continue planting acacia for pulp and paper production despite government orders to restore degraded peatlands, an essential part of the Bornean orangutan’s range. Jong warned that any further habitat loss could “push the already critically endangered Bornean orangutans to extinction.”
- In April, he reported that another company, PT Equator Sumber Rezeki, planned to expand its palm oil plantations in western Borneo. Alarmingly, a quarter of the concession overlaps with orangutan habitat.
Behaviour, resilience and the human factor
Even as forests shrink, conservationists and researchers are uncovering how orangutans adapt to these pressures — and the challenges that come with it.
Local groups are working on practical solutions, such as building canopy bridges to help orangutans cross roads safely and avoid fatal traffic accidents.
Mongabay has also covered studies on the primates’ wellbeing. One report found that sleep deprivation weakens orangutans’ immune systems and may impair mental performance. Another revealed that while orangutans can adjust their nesting habits in response to human activity, such changes often put them in direct conflict with people — creating dangerous long-term consequences.
Why World Orangutan Day Matters
Orangutans are not just a species; they are a symbol of the rainforests themselves. Their decline is a clear signal of how fragile these ecosystems have become under the weight of deforestation, mining, and industrial agriculture.
World Orangutan Day is a reminder that the fate of these great apes lies in human hands. Protecting their forests not only secures their survival but also preserves one of the world’s richest biodiversity hotspots for future generations.
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