Indonesia's forests are home to some of the world's most remarkable wildlife, including orangutans, great apes known for their intelligence, complex behavior and close relationship with forest ecosystems.
But when forests burn, orangutans lose much more than trees.
They can lose their food sources, nesting sites, shelter and access to neighboring forest areas. Smoke can affect their health, while severe habitat damage may force them into unfamiliar landscapes where food and safety are harder to find.
The consequences can continue long after the flames disappear.
Indonesia's forest and land fires, known locally as karhutla, therefore represent a serious conservation challenge. Their effects on orangutans demonstrate how a fire can damage an entire ecosystem rather than simply destroy vegetation.
Why Indonesian Forests Matter to Orangutans
Orangutans are native to the islands of Sumatra and Borneo. Three recognized species are the Sumatran orangutan (Pongo abelii), the Bornean orangutan (Pongo pygmaeus) and the Tapanuli orangutan (Pongo tapanuliensis).
Each depends on forest habitat, although their distributions and ecological requirements differ.
Orangutans spend much of their lives in trees. They use forests to find fruit, leaves, bark, insects and other food, build sleeping nests, move between feeding areas and raise their young.
Forests also provide the space needed for populations to remain connected.
According to the IUCN Red List assessment of the Sumatran orangutan, habitat conversion and fragmentation, hunting and other pressures threaten the species. Fire is one of the threats that can further damage already vulnerable forest landscapes.
For orangutans, a healthy forest is not simply a place to live. It is the foundation of their survival.
How Forest Fires Threaten Orangutans
The effects of a forest fire can be direct or indirect.
Direct effects occur when animals encounter flames, extreme heat or smoke. Indirect effects can continue after a fire has passed, when food supplies decline, habitat becomes fragmented and animals are forced to move.
The main threats include:
- Destruction of feeding and nesting areas
- Loss of fruit-producing trees
- Smoke exposure and respiratory stress
- Dehydration and nutritional stress
- Separation from familiar forest areas
- Increased movement through human-dominated landscapes
- Greater difficulty finding safe habitat
Not every fire produces all these effects. The outcome depends on fire intensity, the size and condition of the affected forest, the availability of nearby habitat and the animals' ability to escape.
However, when large or repeated fires affect orangutan habitat, the cumulative consequences can be severe.
Habitat Loss Is More Than the Loss of Trees
A forest can look green from a distance and still be unsuitable for orangutans.
These animals need more than a minimum number of trees. They depend on the composition, structure and connectivity of the forest.
A fire may destroy fruit-bearing trees while leaving some vegetation standing. It may damage canopy connections that allow orangutans to move through the forest. It can also alter the plant species that regenerate after the fire.
The resulting habitat may offer less food and fewer suitable nesting locations.
If a large area burns, orangutans may be left in smaller forest patches separated by plantations, roads, settlements or degraded land.
This is known as habitat fragmentation.
Fragmentation makes it harder for animals to move between feeding areas and can isolate groups from other suitable habitat.
For an animal that relies heavily on forest resources, these changes can be as consequential as the immediate destruction caused by flames.
Why Food Shortages Become a Serious Problem
Orangutans depend heavily on fruit, but the availability of fruit changes across seasons and locations.
When fire damages a forest, important food trees may be destroyed or take years to recover.
Orangutans may then need to travel farther to find enough food.
Longer travel can require more energy, particularly when animals must navigate damaged habitat or cross open areas.
If food remains scarce, nutritional stress can become a concern.
Young orangutans are especially dependent on their mothers, and females raising infants face additional demands.
The impact of a fire therefore cannot be measured only by the number of hectares burned. Researchers also need to understand which habitat types were damaged and whether surviving orangutans can still access sufficient food.
Can Orangutans Escape a Forest Fire?
Orangutans can move away from immediate danger, but escaping flames does not guarantee survival.
A fire may spread across a large area, while smoke can affect animals beyond the burn perimeter.
An orangutan that escapes may enter a degraded forest, plantation or agricultural landscape where food is limited.
Movement into unfamiliar areas can also increase encounters with people.
In some cases, conservation teams may need to rescue animals that are injured, dehydrated, malnourished or stranded in damaged habitat.
However, not every orangutan affected by a fire requires rescue. Some can remain in or return to surviving forest when conditions permit.
The priority is to assess the animal's condition and the suitability of its habitat rather than assume that relocation is always the best response.
Wildfire Smoke Can Affect Orangutan Health
Fire damages forests, but its smoke can also affect wildlife that survives the flames.
Smoke contains fine particles and gases produced by combustion. Exposure can affect the respiratory system and may alter behavior.
Research published in Scientific Reports in 2018 examined four adult male Bornean orangutans in Central Kalimantan during and after the 2015 fires. The researchers observed increased resting time and reduced travel during the smoke period, with changes in energy-related indicators afterward.
A separate study published in iScience in 2023 found changes in the long calls of four adult male Bornean orangutans during and after the 2015 peatland-fire haze. The researchers reported that calling frequency and vocal quality changed, with some changes persisting after the heavy smoke had cleared.
These studies provide evidence that wildfire smoke can affect orangutan behavior and condition. However, both studies involved small numbers of animals, so their results should not be treated as a complete estimate of the effects on all orangutan populations.
Research sources:
Wildfire smoke impacts activity and energetics of wild Bornean orangutans — Scientific Reports
Wildfire smoke linked to vocal changes in wild Bornean orangutans — iScience
The research highlights an important point: wildlife can be affected by smoke even when individual animals are not visibly burned or injured.
Why Peatland Fires Are Especially Concerning
Indonesia contains extensive tropical peatlands, including areas in Sumatra and Kalimantan that support important wildlife habitat.
Peatlands are ecosystems in which partially decomposed organic material accumulates under waterlogged conditions.
When peatlands are drained and become dry, they can be vulnerable to fire. Once ignited, peat may smolder below the surface, making fires difficult to extinguish and allowing smoke to persist.
For orangutans, peatland fires can destroy forest habitat while producing prolonged smoke.
Repeated fires can also prevent forests from recovering fully, particularly when the landscape remains dry or is repeatedly disturbed.
The relationship is therefore not simply between orangutans and flames. It involves water management, land use, forest structure and the long-term health of the ecosystem.
Read more in our related article: Why Indonesia's Peatlands Keep Burning.
The Connection Between Fires and Deforestation
Forest fires and deforestation are related, but they are not identical.
Deforestation generally involves the conversion of forest to another land use. A fire can damage a forest without permanently converting it to non-forest land.
However, fire can also be part of a broader land-clearing process.
When forest is cleared, drained or degraded, the remaining vegetation and surrounding landscape may become more vulnerable to further fires. If the burned area is subsequently converted to agriculture or another land use, orangutans may lose habitat permanently.
Repeated burning can therefore contribute to a cycle:
Forest degradation → increased vulnerability to fire → habitat damage → reduced forest recovery → further habitat loss.
The relationship varies by location. A single fire does not necessarily mean that a forest will be permanently lost, but repeated fires combined with land conversion can make recovery much more difficult.
Palm Oil, Land Clearing and Orangutan Habitat
Palm oil is an important part of Indonesia's economy, but plantation development can create conservation challenges when it involves the conversion or fragmentation of natural forests.
The environmental outcome depends on the previous land cover, plantation location and management practices.
Plantations established on degraded land have different implications from plantations that replace high-value orangutan habitat.
The key concerns include:
- Conversion of natural forest
- Fragmentation of remaining habitat
- Drainage of peatlands
- Uncontrolled burning during land preparation
- Fires spreading between managed and unmanaged areas
- Reduced connectivity between forest populations
Palm oil production does not automatically mean that a plantation caused a particular fire. Establishing responsibility requires evidence about the fire's origin, land ownership, management and relevant legal obligations.
Nevertheless, protecting orangutans requires careful land-use planning and effective fire prevention throughout landscapes where forests and agricultural areas meet.
Our related article, Palm Oil, Land Clearing and Indonesian Wildfires, examines this relationship in greater detail.
Why Forest Connectivity Matters
Imagine two large forest areas separated by a wide stretch of cleared land.
Even if both forest areas remain standing, the loss of the connection between them can restrict animal movement.
Orangutans may have fewer opportunities to reach new feeding areas or move between suitable habitats.
Fire can worsen this problem by damaging forest corridors that previously connected larger blocks of habitat.
Conservation planning therefore needs to consider not only how much forest remains but also whether forest areas remain connected.
Protecting corridors, restoring degraded areas and maintaining suitable habitat between forest blocks can help support movement across the landscape.
These measures are particularly important where fire, plantation development and roads create increasingly fragmented habitat.
What Happened During Indonesia's 2026 Fire Season?
The 2026 fire season has brought renewed attention to the effects of Indonesian wildfires on orangutans.
In October 2026, Reuters reported that the Yayasan Inisiasi Alam Rehabilitasi Indonesia (YIARI) rescue center in West Kalimantan had taken in increasing numbers of orangutans affected by fires and habitat loss.
According to the report, YIARI had rescued 49 orangutans since August, compared with an annual average of approximately three to five during the preceding three years. The report also described an orangutan named Sampurna, which was found struggling to breathe and died after rescue, with severe lung damage reported by the rescue team.
These are reported figures from a particular rescue organization, not a complete census of every orangutan affected by the fires. They nevertheless illustrate the pressure that severe fire seasons can place on wildlife rescue and rehabilitation services.
Source: Reuters, October 15, 2026.
A separate report from the Associated Press described eight orangutans relocated to protected forest in West Kalimantan after rescue from fire-affected areas. Some had shown signs of malnutrition and dehydration, and the receiving habitat was selected partly for its forest condition, water sources and connectivity.
Source: Associated Press, October 2026.
These reports underline two related challenges: rescuing individual animals in immediate danger and ensuring that suitable habitat remains available for their long-term survival.
What Happens to Orangutans After Rescue?
Rescue is often only the beginning of a long process.
Depending on the circumstances, a rescued orangutan may require veterinary examination, treatment, rehabilitation and an assessment of whether it can safely return to the wild.
Conservation teams may need to evaluate:
- Physical injuries
- Respiratory symptoms
- Dehydration and nutritional condition
- Age and dependence on caregivers
- Ability to forage and move independently
- The availability of suitable release habitat
- Risks from nearby human activities
Young orangutans that have lost their mothers may require particularly intensive care.
Rehabilitation can take a long time because orangutans need to develop the skills required to survive independently.
Rescue centers also have limited space, funding, staff and veterinary resources. When fires displace more animals than usual, those resources can come under pressure.
This is why preventing habitat destruction is generally preferable to relying on rescue after a disaster.
Why Relocation Is Not a Complete Solution
Moving an orangutan away from immediate danger can save its life, but relocation must be carefully planned.
A protected forest is not automatically suitable for every rescued animal.
Before release, conservation teams need to consider whether the habitat has enough food, sufficient forest cover, appropriate water sources and enough space to support the animal without creating additional pressure on resident wildlife.
The presence of other orangutans, the risk of human conflict and the possibility of future fires may also matter.
If the underlying landscape remains vulnerable, relocated animals could face similar risks again.
Rescue and relocation are therefore important emergency measures, but they cannot replace forest protection and restoration.
How Forest Fires Affect Orangutan Populations Over Time
The consequences of a major fire can extend across several years.
Trees may need considerable time to regenerate, and some species may not return in the same abundance or distribution.
During recovery, orangutans may face reduced food availability and fewer nesting sites.
If fires recur before the forest has recovered, the damage can accumulate.
Fragmented populations may also become more isolated, while additional habitat conversion can reduce the options available for movement.
Population-level effects are difficult to measure immediately after a fire. They require long-term monitoring of habitat, animal health, reproduction, survival and movement.
For that reason, conservation success should not be measured only by the number of animals rescued during a crisis. It should also be measured by whether wild populations retain the habitat they need to survive.
What Can Indonesia Do to Protect Orangutans From Fires?
Protecting orangutans requires action at several levels.
1. Protect remaining natural forests
Preventing the conversion of important orangutan habitat can reduce the risk of permanent habitat loss.
2. Keep peatlands wet
Maintaining appropriate water levels can reduce peatland vulnerability to fire.
3. Prevent uncontrolled burning
Land managers should implement effective fire-prevention systems and avoid unsafe land-clearing practices.
4. Detect fires early
Satellite monitoring, ground patrols and local reporting can help identify fires before they spread across large areas.
5. Maintain forest corridors
Connecting habitat patches can help orangutans move between feeding areas and surviving forest.
6. Strengthen wildlife rescue capacity
Rescue organizations need trained personnel, veterinary care, funding and suitable rehabilitation facilities.
7. Plan releases carefully
Relocated orangutans should be released only when the receiving habitat and the animals' condition make release appropriate.
8. Investigate fires responsibly
Where there is evidence of illegal burning or negligence, investigations should establish the facts and apply the relevant laws.
9. Involve local communities
Conservation measures are more sustainable when local communities participate in fire prevention and benefit from viable livelihood options.
10. Monitor recovery over time
Long-term observation is necessary to determine whether burned forests are recovering and whether orangutan populations can continue to use them.
Why Local Communities Matter
People living near forests can be among the first to detect fires.
They also have direct experience of changing landscapes, water availability and land-use pressures.
Community-based fire prevention can include early reporting, local patrols, safe land management and participation in restoration projects.
However, communities should not be treated simply as a source of risk. Many people depend on forest landscapes for their livelihoods, and their circumstances differ widely.
Conservation programs are more likely to succeed when they account for local needs, provide practical alternatives to risky burning and involve residents in decisions that affect their land and resources.
Protecting orangutans and supporting human communities do not have to be competing objectives. With careful planning, both can benefit from healthier forests and reduced fire risk.
How Readers Can Support Orangutan Conservation
Readers outside Indonesia can also help, although individual consumer choices are only one part of a much larger issue.
Practical options include:
- Supporting credible orangutan conservation organizations
- Learning about habitat loss and forest-fire prevention
- Checking the transparency of conservation claims
- Supporting responsible land-use practices
- Considering traceability when evaluating forest-risk commodities
- Avoiding wildlife products and illegal wildlife trade
- Sharing evidence-based information about forest fires
When supporting a conservation organization, readers should check how it reports its work, how funds are used and whether its programs have clear objectives.
No single purchase or donation can resolve Indonesia's wildfire problem. Long-term progress depends on effective policy, land management, community participation and conservation work.
Why Protecting Orangutans Also Protects Forests
Orangutans depend on forests, but the relationship between wildlife and forest ecosystems is broader than a single species.
Healthy forests support biodiversity, store carbon, regulate water and provide habitat for many animals and plants.
Protecting forest landscapes for orangutans can therefore contribute to wider conservation goals.
At the same time, orangutans cannot serve as the only measure of ecosystem health. Many other species and ecological processes may be affected by fires, including organisms that are less visible or receive less public attention.
An effective conservation strategy should protect the integrity of the ecosystem, not just the species that attract the most attention.
The Bigger Lesson
Indonesian forest fires reveal how environmental damage can spread through an ecosystem.
Flames can destroy trees. Smoke can affect animals that escape the fire. Food shortages can place pressure on survivors. Fragmented habitat can restrict movement. Repeated fires can make forest recovery more difficult.
For orangutans, these effects are connected.
Rescuing animals is essential when they are in immediate danger, but rescue cannot compensate for the permanent loss of suitable habitat.
The most effective long-term approach combines fire prevention, forest protection, peatland restoration, responsible land management and community participation.
Conclusion
Orangutans are among the most recognizable animals affected by Indonesia's forest fires, but their plight represents a much wider environmental challenge.
When fires damage natural forests, orangutans can lose food, shelter and safe routes between habitat areas. Smoke can affect their health, while repeated burning and land conversion can undermine the recovery of the ecosystems on which they depend.
Rescue centers provide an essential lifeline for animals in danger. Yet the future of wild orangutans ultimately depends on whether Indonesia can maintain and restore forests large and connected enough to support them.
That means protecting habitat before it burns, keeping vulnerable peatlands wet, preventing uncontrolled fires and ensuring that land development respects ecological limits.
Saving orangutans from a fire matters. Protecting the forest that keeps them alive matters even more.