Western Gorilla: Habitat, Size, Diet, Population & Status
The western gorilla (Gorilla gorilla) is one of the two gorilla species, found in the lowland forests and swamps of western Central Africa, and it is Critically Endangered: the western lowland gorilla is the more numerous subspecies, with an estimated 300,000 or more remaining and still declining, while the Cross River gorilla is the rarest, with only about 250 to 300 left on the Nigeria-Cameroon border.
Western gorillas live in Cameroon, the Central African Republic, Equatorial Guinea, Gabon, the Republic of Congo and Angola’s Cabinda enclave, and they differ from the mountain gorillas that visitors trek in Rwanda and Uganda in size, fur, diet, habitat and numbers. The biggest threats are habitat loss, hunting for bushmeat, and disease, especially Ebola.
This guide explains everything about the western gorilla: its classification, size and appearance, where western gorillas live, what they eat, how many are left, why they are endangered, how they compare with mountain gorillas, and how you can see gorillas in the wild by trekking in Rwanda.
Western Gorilla Facts at a Glance
| Feature | Details |
|---|---|
| Scientific name | Gorilla gorilla |
| Subspecies | Western lowland gorilla (Gorilla gorilla gorilla) and Cross River gorilla (Gorilla gorilla diehli) |
| IUCN status | Critically Endangered |
| Where it lives | Lowland forests and swamps of western Central Africa |
| Range states | Cameroon, Central African Republic, Equatorial Guinea, Gabon, Republic of Congo, Angola (Cabinda); Cross River gorillas in Nigeria and Cameroon |
| Population | Western lowland: roughly 300,000 or more and declining. Cross River: about 250 to 300 |
| Male height (upright) | About 1.4 to 1.7 m (4.7 to 5.6 ft) |
| Male weight | Roughly 140 to 200 kg (300 to 440 lb) |
| Diet | Fruit-heavy, plus leaves, stems, shoots, seeds, bark and insects such as termites and ants |
| Wild lifespan | About 35 to 40 years, sometimes longer |
| Group leader | A dominant silverback male |
Western Gorilla Classification
- Order: Primates
- Family: Hominidae (the great apes)
- Genus: Gorilla
- Species: Gorilla gorilla (the western gorilla)
There are two gorilla species: the western gorilla and the eastern gorilla (Gorilla beringei). The western gorilla has two subspecies, the western lowland gorilla and the Cross River gorilla. The eastern gorilla has two as well, the mountain gorilla and Grauer’s (eastern lowland) gorilla. Western gorillas are the most numerous gorillas, though they are in sharp decline.
Key Characteristics of the Western Gorilla
Like other gorillas, western gorillas are social animals living in groups, often called troops, led by a dominant adult male known as a silverback. A typical western gorilla group is relatively small, made up of one silverback, several adult females and their young.
Appearance. Western gorillas have a robust body covered in fur that is shorter, lighter and more brownish or greyish than the long, thick, black fur of mountain gorillas, which suits their warmer lowland homes. Their noses are broader and flatter than those of mountain gorillas, and adults often have a reddish-brown tinge to the crown of the head.
Size and weight. A western gorilla silverback stands about 1.4 to 1.7 metres (4.7 to 5.6 feet) when upright and typically weighs roughly 140 to 200 kilograms (300 to 440 pounds), with some larger individuals. Females are noticeably smaller, commonly around 70 to 110 kilograms (150 to 250 pounds). Western gorillas are big animals, but they are smaller than eastern gorillas, including mountain gorillas.
The silver back. Males develop a saddle of silver-grey hair across the back as they mature, usually from about 12 years of age, which is where the name silverback comes from.
Western Gorilla Habitat: Where Do Western Gorillas Live?
Western gorillas live in the lowland tropical rainforests and swampy regions of western Central Africa, where fruit-bearing trees and plentiful vegetation provide abundant food:
| Country | Notes |
|---|---|
| Republic of Congo | Holds the largest share of the western lowland gorilla population, including in Odzala-Kokoua National Park |
| Gabon | A major stronghold, with large areas of intact forest |
| Cameroon | Home to both western lowland gorillas and Cross River gorillas |
| Central African Republic | Includes the Dzanga-Sangha reserve |
| Equatorial Guinea | Smaller populations in the mainland forests |
| Angola (Cabinda) | A small population in the enclave’s forests |
| Nigeria | Home to part of the tiny Cross River gorilla population |
Western gorillas prefer less dense lowland forest, forest clearings, and swampy areas called bais, where they feed on aquatic plants and minerals. Cross River gorillas live in hilly, forested areas along the Nigeria-Cameroon border and are separated from other gorillas by many kilometres.
Large areas of western gorilla habitat lie outside protected areas, which makes them vulnerable to logging, farming and development.
Behaviour and Diet of Western Gorillas
Behaviour. Western gorillas are diurnal, active in the day, and they move mainly by knuckle-walking, resting their weight on the backs of their fingers, occasionally walking short distances on two legs.
They communicate with a range of sounds, including screams, grunts, hoots and rumbles, as well as gestures and facial expressions, and silverbacks chest-beat to display. Compared with mountain gorillas, western gorillas tend to climb trees more often to reach fruit and to travel farther each day in search of food.
Diet. Western gorilla diet is dominated by fruit, which is abundant in their lowland forests, supplemented with leaves, stems, shoots, seeds and bark. They also eat aquatic plants in forest clearings and swamps and, unlike most mountain gorillas, regularly eat insects such as termites and ants. Because fruit is seasonal, their diet shifts through the year, and groups roam widely to find it.
Western Gorilla Population: How Many Are Left?
Western gorillas are classified as Critically Endangered by the International Union for Conservation of Nature (IUCN). The numbers differ sharply between the two subspecies:
| Subspecies | Estimated Population | Status |
|---|---|---|
| Western lowland gorilla | Roughly 300,000 or more, with a widely cited survey figure of about 360,000; declining | Critically Endangered |
| Cross River gorilla | About 250 to 300 | Critically Endangered, the rarest of all gorillas |
Estimates are ranges from surveys and are revised over time. You may still see an older figure of around 100,000 quoted for western lowland gorillas; more recent survey work suggests the population is larger than that, but it is still falling.
More than half of all western lowland gorillas are thought to live in the Republic of Congo, with significant numbers in Gabon and Cameroon. Despite those big numbers, the species is classed as Critically Endangered because it has declined so quickly and continues to do so, and because gorillas reproduce slowly, with long gaps between births, so lost animals are not easily replaced.
Why Are Western Gorillas Endangered?
- Habitat loss and deforestation. Logging, farming and expanding settlements clear and fragment the forests gorillas depend on, cutting off their food and breaking up populations.
- Hunting for bushmeat. Despite legal protection, western gorillas are still hunted for meat, and the illegal trade can include captured infants.
- Disease. Ebola has devastated western gorilla populations in parts of Gabon and the Republic of Congo, and gorillas are highly susceptible to human diseases as well.
- Human-wildlife conflict. Gorillas that raid crops can be killed in retaliation as farms spread.
- Mining and development. Mining and infrastructure bring roads, workers and further habitat loss into gorilla forests.
- Climate change. Shifting weather patterns can alter the availability of fruit and water.
Conservation efforts include protected areas, anti-poaching patrols, disease monitoring and cross-border projects such as the Sangha Tri-National landscape, but sustained action is essential.
Western Lowland Gorilla
The western lowland gorilla (Gorilla gorilla gorilla) is the most widespread and numerous gorilla in the world. It has brownish to greyish fur, a broad flat nose, and a silverback with a distinct silver saddle.
It lives in the lowland rainforests and swamps of the Republic of Congo, Gabon, Cameroon, the Central African Republic, Equatorial Guinea and Cabinda.
Gorilla tracking for visitors exists in a few remote places, with Dzanga-Sangha in the Central African Republic and Odzala-Kokoua in the Republic of Congo the best-known specialist options, though they are far more remote and logistically demanding than trekking mountain gorillas.
Cross River Gorilla
The Cross River gorilla (Gorilla gorilla diehli) is the rarest gorilla and one of the rarest great apes, with only about 250 to 300 individuals surviving in scattered, forested hills along the Nigeria-Cameroon border.
It is similar in size to the western lowland gorilla, with dark grey to brownish fur, and males develop a silver saddle as they mature. Because of its tiny population and remote home, it is shy, hard to find and not visited by tourists. Most of its range is legally protected, and conservation work focuses on protecting the forest and monitoring the animals.
Western Gorilla vs. Mountain Gorilla: Key Differences
| Western Gorilla | Mountain Gorilla | |
|---|---|---|
| Species | Western gorilla (Gorilla gorilla) | Subspecies of the eastern gorilla (Gorilla beringei beringei) |
| Where it lives | Lowland forests and swamps of western Central Africa | Misty mountain forests in the Virunga volcanoes and Bwindi |
| Countries | Cameroon, Gabon, Republic of Congo, CAR, Equatorial Guinea, Angola, Nigeria | Rwanda, Uganda and DR Congo |
| Altitude | Lowlands | High altitude, roughly 1,200 to 4,000 metres |
| Fur | Shorter, lighter, brownish-grey | Longer, thicker, darker, black |
| Size | Smaller and slimmer | Larger and more muscular |
| Nose | Broader and flatter | Narrower, with a distinctive nose print |
| Diet | Fruit-heavy, plus insects such as termites and ants | Leaves, stems, shoots and bamboo; very little fruit |
| Group size | Usually smaller groups | Often around 10, sometimes up to 30 or more |
| Climbing | Climbs trees more often | Mostly ground-dwelling |
| Population | Roughly 300,000 or more western lowland; about 250 to 300 Cross River | Roughly 1,063 |
| Status | Critically Endangered | Endangered subspecies within the Critically Endangered eastern gorilla species |
| Can tourists easily see them? | Only at a few remote specialist sites | Yes, on well-established treks in Rwanda and Uganda |
Geographic distribution. Western gorillas live in lowland tropical rainforest and swamps, often near rivers. Mountain gorillas live in the cool, misty forests of the Virunga volcanoes and Bwindi Impenetrable Forest at much higher altitudes. For more on their mountain home, read our guide to the Virunga Mountains.
Conservation outlook. Western gorillas far outnumber mountain gorillas, but they are declining across most of their range, while mountain gorillas have grown in number thanks to intensive protection concentrated in a small number of parks. That contrast shows how much focused conservation can achieve, and tourism has played a role by funding protection and giving local communities a stake in the gorillas’ survival.
How Long Do Western Gorillas Live?
In the wild, western gorillas typically live around 35 to 40 years, and some may reach about 50. Disease, injury, predation and food shortages all shape lifespan, and infant mortality is high.
In captivity, gorillas often live longer, commonly into their 50s and sometimes beyond, because they are protected from predators and receive regular food and veterinary care. Captive gorillas can, however, miss the stimulation and social complexity of the wild.
Gorilla Tourism: Ethical Guidelines for Visiting Gorillas
Responsible gorilla tourism can support conservation. When you visit gorillas in the wild, whether in Rwanda’s Volcanoes National Park or Uganda’s Bwindi, follow these principles:
- Keep your distance. Stay at least 7 metres (about 23 feet) from the gorillas to reduce stress and disease risk, and never touch them.
- Stay healthy. Gorillas catch human illnesses, so anyone who is sick should not trek.
- Stay quiet and calm. Follow your guide’s instructions and keep your voice low.
- Choose responsible operators. Pick licensed companies that follow park rules and benefit local people.
- Support conservation. Permit fees help pay for rangers, anti-poaching patrols, habitat protection and community projects.
- Share what you learn. Educated travellers are advocates for gorilla protection.
Read our full rules and guidelines for gorilla trekking before you go.
See Gorillas in the Wild: Mountain Gorilla Trekking in Rwanda
Western gorillas live in remote lowland forests that most travellers never reach, but you can see wild mountain gorillas, the western gorilla’s high-altitude cousins, on well-organised treks in Rwanda and Uganda.
In Rwanda, gorilla trekking takes place in Volcanoes National Park, about two to three hours’ drive from Kigali. Visitors are guided to habituated gorilla families and spend one hour with them.
A Rwanda gorilla permit costs USD 1,500 per person for foreign non-residents, with permits limited each day, so book early. In Uganda, the gorilla permit in Bwindi Impenetrable Forest costs USD 800 per person.
Plan your gorilla trek:
- Check Rwanda gorilla permit availability for your dates.
- Take a classic 1-day Rwanda gorilla trek, or see two families on the 4-day Rwanda double gorilla trekking safari.
- Choose luxury gorilla trekking in Rwanda or read our budget travel guide to Rwanda.
- Combine gorillas with the Big Five in Akagera National Park, and plan with our guides to Rwanda tourism, safari destinations in Rwanda and tourist attractions in Rwanda.
- Pair Rwanda and Uganda on our 12-day Rwanda and Uganda safari, or explore Uganda’s primate and wildlife safaris, including the 4 days Bwindi gorillas and Kibale chimpanzees, the 5 days Bwindi gorillas and Queen Elizabeth, the 8-day Uganda primate safari and the 14 days Uganda wildlife safari.
- For photographers, see our Rwanda photography safari, and for where to stay, our Rwanda lodge booking tips.
Frequently Asked Questions About the Western Gorilla
What is a western gorilla? One of the two gorilla species (Gorilla gorilla), living in the lowland forests and swamps of western Central Africa, with two subspecies: the western lowland gorilla and the Cross River gorilla.
Where do western gorillas live? In Cameroon, the Central African Republic, Equatorial Guinea, Gabon, the Republic of Congo and Angola’s Cabinda enclave, with Cross River gorillas along the Nigeria-Cameroon border.
Are western gorillas endangered? Yes. The western gorilla is Critically Endangered, as are both of its subspecies.
How many western gorillas are left? Roughly 300,000 or more western lowland gorillas, though the population is declining, and only about 250 to 300 Cross River gorillas.
How big is a western gorilla? A silverback stands about 1.4 to 1.7 metres (4.7 to 5.6 feet) upright and weighs roughly 140 to 200 kilograms (300 to 440 pounds). Females are smaller.
What do western gorillas eat? Mostly fruit, plus leaves, stems, shoots, seeds, bark, aquatic plants and insects such as termites and ants.
What is the difference between a western gorilla and a mountain gorilla? Western gorillas live in lowland forests and swamps, have shorter, lighter fur, eat more fruit and insects, and are far more numerous. Mountain gorillas live in high-altitude forests, have thick dark fur, eat mainly leaves and stems, and number only about 1,063.
What is the rarest gorilla? The Cross River gorilla, with only about 250 to 300 individuals.
How long do western gorillas live? About 35 to 40 years in the wild, sometimes longer, and often into their 50s in captivity.
Why are western gorillas endangered? Habitat loss, bushmeat hunting, disease (especially Ebola), human-wildlife conflict and mining and development.
Can you see western gorillas as a tourist? Only at a few remote specialist sites, such as Dzanga-Sangha in the Central African Republic and Odzala-Kokoua in the Republic of Congo. Mountain gorilla trekking in Rwanda and Uganda is far easier to arrange.
Where can I see gorillas in Rwanda? In Volcanoes National Park, where treks visit habituated mountain gorilla families. See our Rwanda gorilla permit availability guide.
How close can you get to a gorilla? You should stay at least 7 metres (about 23 feet) away, following your ranger’s instructions.
Meet the Gorillas With Trek Rwanda Gorillas
Western gorillas live far from the usual tourist routes, but mountain gorillas, their high-altitude relatives, can be met on a short trek in Rwanda. At Trek Rwanda Gorillas, we operate under Rwanda Development Board licensing and plan every detail of your gorilla safari, from your permit to your lodge and transfers. Gorilla permits are limited every day, so contact our team to check availability and book.
