Grauer’s and Mountain Gorillas in DR Congo: Features, Habitat, Diet & Gorilla Tours in Congo

Grauer’s gorilla and the mountain gorilla are two remarkable subspecies of eastern gorillas found in East and Central Africa. The Democratic Republic of Congo (DR Congo) is particularly important for gorilla conservation because it is home to both Grauer’s gorillas and mountain gorillas, making Congo an exceptional destination for wildlife enthusiasts, primate researchers, photographers, and adventurous travelers.

Grauer’s gorilla, also known as the eastern lowland gorilla, is found primarily in eastern DR Congo, especially around Kahuzi-Biega National Park and the Itombwe Massif. Mountain gorillas, meanwhile, inhabit the high-altitude forests of the Virunga Mountains, which extend across DR Congo, Rwanda, and Uganda.

Although both belong to the eastern gorilla group, they differ considerably in appearance, habitat, diet, behavior, and adaptation to their environments.

Grauer’s Gorilla vs. Mountain Gorilla

The two subspecies are closely related, but their physical characteristics reflect the different environments in which they live.

Grauer’s Gorilla

Grauer’s gorilla is the largest of the four recognized gorilla subspecies and is considered the largest living primate.

It is characterized by:

• A large, stocky body
• Large hands and feet
• A broad chest and shoulders
• A cone-shaped skull caused by a prominent bony crest
• A relatively short muzzle
• Longer arms compared with its legs
• Darker and generally shorter fur than mountain gorillas
• Large thumbs relative to the fingers

Adult male Grauer’s gorillas can weigh more than 200 kilograms, while females are considerably smaller. Their powerful bodies and long arms are adaptations to life in the dense forests of eastern DR Congo.

 

Mountain Gorilla

Mountain gorillas are adapted to much higher elevations and colder environments.

They generally have:

• Longer and thicker fur
• A powerful body and broad chest
• Long jaws and teeth
• A characteristic cone-shaped head
• Shorter limbs relative to their body compared with some lowland populations
• Thick coats that provide insulation in cold mountainous forests

Adult male mountain gorillas can weigh close to 200 kilograms, while females generally weigh between 90 and 100 kilograms.

The thick, dark coat of the mountain gorilla is particularly important because these animals live in cool, high-altitude environments.

The Silverback Gorilla

One of the most recognizable features of adult male gorillas is the silver hair that develops across the back.

Male gorillas generally reach full physical maturity around 12–13 years of age. As they mature, silver hair develops across their backs, giving rise to the famous term “silverback.”

A dominant silverback normally leads and protects a gorilla family. He plays an important role in defending the group, resolving conflicts, selecting resting and feeding areas, and maintaining social cohesion.

A gorilla family may also contain other adult males, females, juveniles, and infants.

Diet of Grauer’s and Mountain Gorillas

Both Grauer’s and mountain gorillas are primarily herbivorous, although they may occasionally consume insects, larvae and other small animal matter.

What Do Mountain Gorillas Eat?

Mountain gorillas feed mainly on vegetation, including:

• Leaves
• Stems
• Shoots
• Roots
• Bark
• Pith
• Thistles
• Nettles
• Wild celery
• Bamboo shoots

Because mountain gorillas live at high elevations where fruit is relatively scarce, their diet contains much less fruit than that of many lowland gorillas.

Mountain gorillas have been recorded eating parts of numerous plant species throughout their habitat. They may also consume insects, larvae, ants and snails.

What Do Grauer’s Gorillas Eat?

Grauer’s gorillas have access to a wider variety of vegetation because they occupy lower and more diverse forest habitats.

Their diet includes:

• Leaves
• Young shoots
• Herbs
• Fruits
• Seeds
• Nuts
• Fungi
• Bamboo shoots

Fruit becomes particularly important during the wetter months, while figs are among the fruits they may consume.

Both eastern gorilla subspecies can consume large quantities of vegetation every day. Their strong hands, powerful jaws and dexterous lips allow them to strip vegetation and select the most nutritious parts.

How Do Gorillas Get Water?

Gorillas obtain much of their water from the vegetation they eat. They may also drink from natural water sources when available.

An interesting adaptation observed in gorillas is their ability to use the hair on the backs of their hands to collect water before bringing it to their mouths.

Their feeding behavior also demonstrates an important relationship with the forest. Rather than completely destroying an area of vegetation, gorillas often move through different feeding areas, allowing plants to regenerate.

Habitat of Grauer’s Gorillas in DR Congo

Grauer’s gorillas are found exclusively in the Democratic Republic of Congo, making the country one of the most important destinations for observing this endangered great ape.

They inhabit elevations ranging approximately from 600 to 2,900 metres above sea level and can occur in several forest environments, including:

• Lowland tropical rainforest
• Secondary forest
• Transitional forest
• Afromontane forest
• Bamboo forest
• Swamps
• Peatland habitats

Their remaining strongholds include Kahuzi-Biega National Park and the Itombwe Massif.

Kahuzi-Biega is particularly famous for its Grauer’s gorilla population and is one of the best-known destinations for Grauer’s gorilla trekking in DR Congo.

Where Are Mountain Gorillas Found?

Mountain gorillas have a very restricted geographic range.

They occur in two major populations:

1. Bwindi Impenetrable National Park in Uganda
2. The Virunga Mountains, shared by DR Congo, Rwanda and Uganda

The Virunga mountain gorilla population lives at high elevations and occupies a mixture of bamboo forests, montane forests and subalpine vegetation.

In DR Congo, mountain gorillas are protected within Virunga National Park, one of Africa's most important protected areas and a major destination for gorilla trekking in Congo.

Gorilla Behaviour and Social Life

Gorillas are highly social animals and normally live in family groups led by a dominant silverback.

A typical eastern gorilla group may include:

• A dominant silverback
• Other adult males
• Several adult females
• Juveniles
• Infants

Groups vary greatly in size, and exceptionally large groups have been recorded.

The dominant silverback is responsible for much more than protection. He helps determine where the group feeds and sleeps and plays an important role in maintaining order within the family.

Gorillas communicate through body language, facial expressions, and vocalizations. They may use chest beating, displays, vocal calls, and other intimidating behaviors when confronted by a rival or perceived threat.

Despite their enormous size and strength, gorillas are generally peaceful and non-aggressive animals when left undisturbed.

Gorilla Communication

Eastern gorillas use a variety of vocalizations to communicate with members of their group.

These can include:

• Grunts
• Barks
• Hoots
• Roars
• Alarm calls
• Other social vocalizations

Chest beating is perhaps the most famous gorilla behavior. It can communicate dominance, excitement, warning or intimidation and does not necessarily indicate that a gorilla is preparing to attack.

Gorilla Reproduction and Family Life

Gorilla family bonds are exceptionally strong.

Female gorillas generally give birth to a single infant after a gestation period of approximately nine months. Infants remain highly dependent on their mothers during their early years.

Young gorillas may ride on their mothers' backs, while other members of the family—including the dominant silverback—may interact with, protect and play with infants.

Females generally give birth every several years, allowing considerable time for mothers to care for each offspring.

As young males mature, they may eventually leave their birth groups and spend time alone or with other males before establishing or joining a new family group.

Gorillas and Their Conservation Challenges

Both Grauer’s gorillas and mountain gorillas are endangered, and their survival depends heavily on effective conservation, habitat protection, research and responsible tourism.

Grauer’s gorillas have experienced significant habitat loss and population decline, while their remaining range is much smaller than it was historically.

Mountain gorillas have also faced serious conservation challenges, including habitat pressure, disease risks, human-wildlife conflict and other threats.

Conservation programs, national parks, local communities, researchers and responsible tourism operators all play important roles in protecting these extraordinary animals.

Why Go Gorilla Trekking in DR Congo?

A gorilla trekking safari in DR Congo offers a rare opportunity to encounter some of the world's most fascinating great apes in their natural environment.

Congo is particularly unique because travelers can experience different gorilla habitats and species within the same country.

Grauer’s Gorilla Trekking in Kahuzi-Biega

Kahuzi-Biega National Park is one of the most important places in Africa for experiencing Grauer’s gorillas.

A trek through the forest can take visitors into the habitat of these enormous eastern lowland gorillas while also providing an opportunity to explore one of DR Congo's remarkable biodiversity hotspots.

Mountain Gorilla Trekking in Virunga

Virunga National Park offers the opportunity to trek mountain gorillas in the spectacular Virunga volcanic landscape.

The experience combines rainforest, mountains, wildlife and close encounters with habituated gorilla families.

For travelers seeking an extraordinary Congo safari, gorilla trekking in Virunga can be combined with other experiences depending on current park conditions, security requirements and tourism availability.

Grauer’s Gorilla vs. Mountain Gorilla: Key Differences

Feature	Grauer’s Gorilla	Mountain Gorilla
Common name	Eastern lowland gorilla	Mountain gorilla
Main range	Eastern DR Congo	Uganda, Rwanda & DR Congo
DR Congo destination	Kahuzi-Biega National Park	Virunga National Park
Habitat	Lowland to montane forests	High-altitude montane forests
Fur	Generally shorter	Longer and thicker
Body size	Largest gorilla subspecies	Very large, powerful build
Diet	Vegetation, fruit, seeds, fungi and more	Mainly leaves, stems, shoots and other vegetation
Altitude	Approximately 600–2,900 m	Generally higher-elevation habitat
Social structure	Stable family groups	Stable family groups
Conservation status	Critically endangered	Endangered

Plan Your Gorilla Tour in Congo

A gorilla tour in DR Congo is more than an ordinary wildlife holiday. It is an opportunity to enter some of Central Africa's most extraordinary forests and witness endangered great apes in the environment where they evolved.

Whether you are interested in Grauer’s gorilla trekking in Kahuzi-Biega, mountain gorilla trekking in Virunga, wildlife photography, primate research or an extended Congo adventure, careful planning and responsible travel are essential.

At Ultimate Wild Safaris, we help travelers plan memorable gorilla and wildlife experiences across East and Central Africa.

Discover the Undiscovered. Touch the Unknown. Explore the Unique Before It Disappears.

Book Your Congo Gorilla Safari

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