# Javan gibbon

> A silvery small ape dependent on Java’s forest canopy. Calls, family relationships, and routes through the trees shape its life.

Source: https://panduanhewan.org/en/species/javan-gibbon/ · Updated 7 October 2026 · English · Bahasa Indonesia: https://panduanhewan.org/id/spesies/owa-jawa/
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**Review status:** Approved by team on 2026-10-07. Approval covers this version’s narrative, facts, quick answers and recorded locations in both languages.

## Quick answer

The Javan gibbon (*Hylobates moloch*) is a mammal in the family Hylobatidae. Range in Indonesia: Forests on Java. It is endemic to Indonesia, living naturally only in Western and central Java (Banten, West Java, Central Java). Diet: fruit, leaves, and flowers; a herbivore. IUCN Red List status: Endangered. It is a legally protected species in Indonesia (Regulation P.106/2018).

| Fact | Value |
|---|---|
| Scientific name | *Hylobates moloch* |
| Indonesian name | Owa Jawa |
| Group | Mammals |
| Family | Hylobatidae |
| Range in Indonesia | Forests on Java |
| Linked habitats | [Tropical Rainforests](https://panduanhewan.org/en/habitats/tropical-rainforest/) |
| Range | Endemic to Java |
| Characteristic movement | Arm-swinging |
| Diet | Fruit, leaves, and flowers |
| IUCN status | Endangered · [IUCN Red List (via GBIF)](https://www.gbif.org/species/5219552) · checked 1 October 2026 |
| Legal protection in Indonesia | Protected · [Regulation P.106/2018](https://jdih.kehutanan.go.id/new2/uploads/files/P_106_2018_JENIS_TSL_menlhk_07252019152513.pdf) · annex no. 68 |
| Population estimate | Fewer than 4,500 individuals in the wild · [The Aspinall Foundation — Javan gibbon](https://www.aspinallfoundation.org/port-lympne/wildlife-park/animals/javan-gibbon/) |
| Diet type | Herbivore (plant-eater) — mainly fruit (frugivore), plus leaves, flowers and a few insects · [IUCN Red List](https://www.iucnredlist.org/species/10550/17966495) |
| Reproduction | Giving birth to live young (viviparous) · [Animal Diversity Web](https://animaldiversity.org/accounts/Mammalia/) |
| Observance days | [Indonesian Primate Day (30 January)](https://panduanhewan.org/en/animal-days-calendar/#hari-primata-indonesia) |
| Active | Diurnal (active by day) · [EltonTraits 1.0 (Wilman et al. 2014, Ecology 95:2027), MamFuncDat.txt](https://esapubs.org/archive/ecol/E095/178/MamFuncDat.txt) |
| Endemic to Indonesia | Yes — Western and central Java (Banten, West Java, Central Java) · [IUCN Red List](https://www.iucnredlist.org/species/10550/17966495) |

## A small ape of Java

The Javan or silvery gibbon belongs to Hylobatidae. It is an ape, distinct from monkeys, and has no tail. Hylobates moloch helps distinguish it from other gibbons in educational material that uses the word gibbon without specifying a species or location.

Evidence: [University of Michigan Animal Diversity Web — Hylobates moloch](https://animaldiversity.org/accounts/Hylobates_moloch/) · [Mammalian Species — Hylobates moloch, 2022](https://academic.oup.com/mspecies/article/54/1021/seac006/6748852)

## The canopy as a travel route

Long arms help gibbons swing between branches, a movement called brachiation. Forest supplies the three-dimensional structure for this travel. A canopy gap is more than distance on a map: broken tree connections can alter access to food and group space, making connectivity part of habitat quality.

Evidence: [University of Michigan Animal Diversity Web — Hylobates moloch](https://animaldiversity.org/accounts/Hylobates_moloch/)

## Food and family space

Fruit, leaves, and flowers are part of a Javan gibbon’s diet. Family groups use forest space whose resources change with the seasons. Protecting one currently productive fruit tree cannot secure year-round needs; diverse vegetation offers alternatives when a particular resource is unavailable.

Evidence: [Mammalian Species — Hylobates moloch, 2022](https://academic.oup.com/mspecies/article/54/1021/seac006/6748852)

## Calls are not an invitation to approach

Adult Javan gibbon pairs do not duet like many other gibbons; both sexes have solo songs. A 2022 study of three groups at Gunung Halimun-Salak also documented offspring joining their mothers’ songs. Offspring co-singing is distinct from a pair duet. PanduanHewan recommends listening at the site’s required distance without playback to draw animals in.

Evidence: [Yi et al. — Vocal development in wild Javan gibbons, 2022](https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2022.910260/full) · [Mammalian Species — Hylobates moloch, 2022](https://academic.oup.com/mspecies/article/54/1021/seac006/6748852)

## From rescue towards wild life

The Aspinall Foundation reports rehabilitation and release of Javan primates affected by trade. This requires assessment of animal and habitat, not simply opening a cage. Conservation must also reduce new removals from the wild; reject keeping infant gibbons and use reporting routes for suspected trade.

Evidence: [The Aspinall Foundation — Working to save Javan gibbons](https://blog.aspinallfoundation.org/working-to-save-javan-gibbons)

## Scientific classification of the Javan gibbon

| Rank | Name |
|---|---|
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Mammalia |
| Order | Primates |
| Family | Hylobatidae |
| Genus | *Hylobates* |
| Species | *Hylobates moloch* |

Source: [GBIF Backbone Taxonomy](https://www.gbif.org/dataset/d7dddbf4-2cf0-4f39-9b2a-bb099caae36c)

## Common questions about the Javan gibbon

### What is the scientific name of the Javan gibbon?

The scientific name of the Javan gibbon is *Hylobates moloch*, in the family Hylobatidae. In Indonesian it is called Owa Jawa.

### What kind of animal is the Javan gibbon?

The Javan gibbon is a mammal in the family Hylobatidae. By diet it is a herbivore (plant-eater): a mainly fruit (frugivore), plus leaves, flowers and a few insects. It is also endemic to Indonesia.

### Where does the Javan gibbon live in Indonesia?

In Indonesia, this guide records the Javan gibbon in: Forests on Java.

The Javan gibbon is endemic to Indonesia and lives naturally only in Western and central Java (Banten, West Java, Central Java). Source: [IUCN Red List](https://www.iucnredlist.org/species/10550/17966495).

Source-supported habitats: [Tropical Rainforests](https://panduanhewan.org/en/habitats/tropical-rainforest/).

### What does the Javan gibbon eat?

Diet of the Javan gibbon: fruit, leaves, and flowers. That makes it a herbivore (plant-eater). Source: [IUCN Red List](https://www.iucnredlist.org/species/10550/17966495).

### How does the Javan gibbon reproduce?

The Javan gibbon reproduces by giving birth to live young (viviparous). Source: [Animal Diversity Web](https://animaldiversity.org/accounts/Mammalia/).

### Is the Javan gibbon nocturnal?

The cited source records the Javan gibbon as diurnal (active by day). Source: [EltonTraits 1.0 (Wilman et al. 2014, Ecology 95:2027), MamFuncDat.txt](https://esapubs.org/archive/ecol/E095/178/MamFuncDat.txt).

See also [the list of nocturnal and diurnal animals in Indonesia](https://panduanhewan.org/en/species/nocturnal-and-diurnal-animals/).

### How large is the population of the Javan gibbon?

Fewer than 4,500 individuals in the wild. Source: [The Aspinall Foundation — Javan gibbon](https://www.aspinallfoundation.org/port-lympne/wildlife-park/animals/javan-gibbon/). Wild population figures are estimates and can differ between surveys.

### What is the scientific classification of the Javan gibbon?

Scientific classification of the Javan gibbon: kingdom Animalia, phylum Chordata, class Mammalia, order Primates, family Hylobatidae, genus *Hylobates*, species *Hylobates moloch*.

Source: [GBIF Backbone Taxonomy](https://www.gbif.org/dataset/d7dddbf4-2cf0-4f39-9b2a-bb099caae36c), adjusted to the ranks commonly used in school biology.

### Is the Javan gibbon endangered?

Yes. On the IUCN Red List, the Javan gibbon is listed as Endangered: it is considered to face a very high risk of extinction in the wild. Source: [IUCN Red List (via GBIF)](https://www.gbif.org/species/5219552), checked 1 October 2026.

This global category is separate from national legal protection. [Is the Javan gibbon protected in Indonesia?](#protected)

### Is the Javan gibbon protected in Indonesia?

Yes. The Javan gibbon (*Hylobates moloch*) is a protected species in Indonesia under [Environment and Forestry Ministerial Regulation No. P.106/MENLHK/SETJEN/KUM.1/12/2018 on protected plant and animal species](https://jdih.kehutanan.go.id/new2/uploads/files/P_106_2018_JENIS_TSL_menlhk_07252019152513.pdf) (annex, entry 68).

Article 21(2) of Law No. 5 of 1990, as amended by Law No. 32 of 2024, prohibits anyone from hunting, catching, injuring, killing, storing, owning, keeping, transporting or trading a protected animal, alive or dead, including its body parts, eggs and nests.

If you see this animal being traded, kept or injured, contact the [local BKSDA office](https://panduanhewan.org/en/bksda-offices/).

### Can the Javan gibbon be kept as a pet?

No. Because the Javan gibbon is a protected species, catching, owning, keeping, transporting or trading it without a permit is prohibited by law. Trading without a permit through electronic media is also prohibited.

If you see this animal for sale or being kept, report it to the [local BKSDA office](https://panduanhewan.org/en/bksda-offices/).

## Sources & references

1. [University of Michigan Animal Diversity Web — Hylobates moloch](https://animaldiversity.org/accounts/Hylobates_moloch/)
2. [Mammalian Species — Hylobates moloch, 2022](https://academic.oup.com/mspecies/article/54/1021/seac006/6748852)
3. [Yi et al. — Vocal development in wild Javan gibbons, 2022](https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2022.910260/full)
4. [The Aspinall Foundation — Working to save Javan gibbons](https://blog.aspinallfoundation.org/working-to-save-javan-gibbons)
5. [Peraturan Menteri LHK Nomor P.106/MENLHK/SETJEN/KUM.1/12/2018 tentang Jenis Tumbuhan dan Satwa yang Dilindungi](https://jdih.kehutanan.go.id/new2/uploads/files/P_106_2018_JENIS_TSL_menlhk_07252019152513.pdf)
6. [The Aspinall Foundation — Javan gibbon](https://www.aspinallfoundation.org/port-lympne/wildlife-park/animals/javan-gibbon/)
7. [IUCN Red List](https://www.iucnredlist.org/species/10550/17966495)
8. [Animal Diversity Web](https://animaldiversity.org/accounts/Mammalia/)
9. [EltonTraits 1.0 (Wilman et al. 2014, Ecology 95:2027), MamFuncDat.txt](https://esapubs.org/archive/ecol/E095/178/MamFuncDat.txt)
10. [GBIF Backbone Taxonomy (GBIF)](https://www.gbif.org/dataset/d7dddbf4-2cf0-4f39-9b2a-bb099caae36c)

## Further reading

[Gibbon: facts, threats and conservation](https://worldanimalrescuenetwork.org/wildlife-guides/gibbon/) — World Animal Rescue Network. A broader overview that covers this animal.

_Related site: PanduanHewan’s founder is also a director of World Animal Rescue Network._

## Keep exploring

- [Tropical Rainforests](https://panduanhewan.org/en/habitats/tropical-rainforest/)
- [Siamang](https://panduanhewan.org/en/species/siamang/)
- [Javan slow loris](https://panduanhewan.org/en/species/javan-slow-loris/)
- [Reporting Suspected Wildlife Trafficking](https://panduanhewan.org/en/emergency/report-wildlife-trade/)
- [Javan leopard](https://panduanhewan.org/en/species/javan-leopard/)
- [Agile gibbon](https://panduanhewan.org/en/species/agile-gibbon/)

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Cite: PanduanHewan. (2026). Javan gibbon. PanduanHewan.org. https://panduanhewan.org/en/species/javan-gibbon/