# Gibbon — Facts, Threats & Conservation

*Family Hylobatidae — ~20 species in 4 genera (Hylobates, Hoolock, Nomascus, Symphalangus)*

> Gibbons are tailless lesser apes of South-east Asian rainforest, brachiating through the canopy in monogamous family groups; most species are Endangered or Critically Endangered due to habitat loss and the illegal pet trade.

**IUCN status:** Varies by species (Endangered to Critically Endangered)  ·  **WARN range:** South-east Asia, China, India (north-east), Borneo, Sumatra

## Quick facts
| Fact | Value |
| --- | --- |
| Common name | Gibbon (lesser ape) |
| Species | ~20 recognised species |
| Tail | Absent — like all apes |
| Social unit | Monogamous family group |
| Locomotion | Brachiation through the canopy |
| CITES | Appendix I — all species |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Mammalia
- **Order:** Primates
- **Suborder:** Haplorhini
- **Family:** Hylobatidae (gibbons)

## Conservation status
- **Status:** Most species Endangered or Critically Endangered. Hainan gibbon (Nomascus hainanus) is Critically Endangered with fewer than 40 individuals.
- **Population:** Varies by species — from fewer than 40 (Hainan) to tens of thousands (some Hylobates)
- **Trend:** Decreasing for most species due to habitat loss
- **Assessed:** Varies by species (IUCN Red List ongoing)
- **CITES:** Appendix I — all gibbon species

## Key facts: Gibbon
- Gibbons are lesser apes — tailless, like orangutans and chimpanzees, unlike monkeys.
- They brachiate hand-over-hand through the canopy, covering up to 10 m per swing.
- Monogamous pairs defend territories with loud dawn duets that identify the species.
- Most gibbon species are Endangered or Critically Endangered due to deforestation.
- Infants are taken from the wild for the illegal pet trade after mothers are killed.
- Gibbons need intact primary forest — they cannot survive in oil palm or logged woodland.

## Lesser apes of the canopy
Gibbons belong to the superfamily Hominoidea alongside great apes and humans, but form their own family, Hylobatidae. They are the smallest apes — typically 5–10 kg — with extraordinarily long arms, hook-shaped hands and reduced thumbs adapted for swinging. Unlike great apes, gibbons do not build nests; they sleep sitting upright in trees.

Four genera are recognised: Hylobates (white-handed and agile gibbons), Hoolock (western and eastern hoolock gibbons of India and Myanmar), Nomascus (crested gibbons of Vietnam, Laos and China) and Symphalangus (siamang, the largest gibbon). Each species has a distinctive song, allowing identification by ear alone.

## Social life and song
Gibbons live in monogamous family groups of two to six individuals — an adult pair and their offspring. Pairs defend territories of roughly 20–50 hectares through loud vocal duets performed at dawn. The male and female sing coordinated phrases that can carry over two kilometres. These songs advertise pair bonds, deter rivals and help biologists census wild populations.

Young gibbons remain with their parents for six to ten years, learning territory boundaries and song structure. This slow life history makes populations vulnerable to hunting and habitat loss — removing one breeding pair can eliminate a territory for a generation.

## Threats and the pet trade
Deforestation is the primary threat. South-east Asia has lost vast areas of lowland rainforest to oil palm, rubber, logging and dam construction. Gibbons cannot cross open ground between forest fragments; isolated groups face inbreeding and local extinction. Hunting for food and traditional medicine persists in some areas. The illegal pet trade is particularly cruel: adult gibbons are shot to capture dependent infants, which are sold as pets or for tourist photo props. Gibbons are poor pets — they need vast enclosures, lifelong pair bonds and specialist diets. Most confiscated gibbons cannot be released and require lifetime sanctuary care.

## Conservation and recovery
CITES lists all gibbon species on Appendix I, banning commercial international trade. Protected areas and wildlife corridors are essential for connecting fragmented populations. Captive breeding programmes at zoos and sanctuaries support reintroduction efforts for species such as the Hainan gibbon — the world's rarest ape, with fewer than 40 individuals. Community-based forest patrols and ecotourism that values living gibbons over dead ones have helped stabilise some populations. WARN's orangutan work in Indonesia and Malaysia overlaps gibbon range, where shared habitat protection benefits all arboreal apes.

## Related WARN guides
Gibbons are lesser apes — read WARN's gorilla, chimpanzee and orangutan guides for great ape context, monkey species library for wider primates, and tarsier page for other South-east Asian primates.

Song and pair-bonding make gibbons unique; pet trade and deforestation threaten every species.

WARN's orangutan work in Indonesia and Malaysia overlaps gibbon rainforest habitat.

## What WARN does
WARN funds orangutan habitat protection and anti-trafficking work in Indonesia and Malaysia — range countries where gibbons share the same threatened rainforest. This gibbon guide is free public education connecting readers to the wider primate crisis in South-east Asia.

If this guide helps you understand wildlife and the pressures it faces, a gift to WARN supports habitat protection and free public education in our partner countries.

## Frequently asked questions: Gibbon
### Are gibbons monkeys or apes?
Gibbons are apes — specifically lesser apes. They are tailless, like orangutans and chimpanzees, and belong to the superfamily Hominoidea. Monkeys have tails and belong to separate evolutionary branches.

### How many gibbon species are there?
Roughly 20 species are recognised across four genera: Hylobates, Hoolock, Nomascus and Symphalangus (siamang). Taxonomy continues to be refined as genetic studies reveal new species.

### Why do gibbons sing?
Gibbon pairs perform loud dawn duets to defend their territory, strengthen pair bonds and advertise their presence to neighbours. Each species has a distinctive song, allowing identification without visual contact.

### Are gibbons endangered?
Most gibbon species are Endangered or Critically Endangered. The Hainan gibbon is the rarest ape on Earth, with fewer than 40 individuals. Habitat loss and the pet trade are the main threats.

### Can you keep a gibbon as a pet?
No. Gibbons need large forest enclosures, lifelong pair bonds and decades of specialist care. The pet trade kills mothers to capture infants. Private ownership is illegal in most countries.

### What is brachiation?
Brachiation is arm-over-arm swinging through the canopy. Gibbons are the most specialised brachiators among primates, using their long arms and hook-shaped hands to travel at speeds exceeding 50 km/h.

## Sources
- [IUCN Red List — Hylobatidae assessments](https://www.iucnredlist.org/)
- [Gibbon Conservation Alliance](https://www.gibbonconservation.org/)
- [CITES — Checklist of CITES Species](https://checklist.cites.org/)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/gibbon