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Eastern Gorilla: Characteristics, Diet, Facts & More [Fact Sheet]

The Eastern Gorilla, the largest of the living primates, is an imposing yet remarkably gentle creature found in the forests of Central Africa.

This magnificent species, known for its profound intelligence and complex social structures, has captured the imagination and empathy of people worldwide.

In this article, we delve into the world of the Eastern Gorilla, exploring its characteristics, behavior, and the urgent conservation efforts needed to ensure its survival.

The Eastern Gorilla at a Glance


Class:Mammalia (Mammals)
Species:G. beringei

Essential Information

Average Size:Height: Up to 6 ft (1.8 m) for males
Average Weight:Males: 300-485 lbs (135-220 kg), Females: Half the weight of males
Average Lifespan:Around 35-40 years in the wild, longer in captivity
Geographical Range:Eastern Democratic Republic of Congo, northwestern Rwanda, and southwestern Uganda
Conservation Status:Critically Endangered (IUCN Red List)

Species and Subspecies

The Eastern Gorilla (Gorilla beringei) is divided into two subspecies: the Mountain Gorilla (Gorilla beringei beringei) and the Eastern Lowland Gorilla (Gorilla beringei graueri).

The Mountain Gorilla is the more famous of the two, known for its thick fur, which is an adaptation to the colder climates of the mountainous regions it inhabits.

The Eastern Lowland Gorilla, in contrast, has shorter fur and is the largest of all the gorilla subspecies, found in the lowland tropical forests.

The key differences between these subspecies lie in their physical appearance, habitat, and in some behavioral aspects. Mountain Gorillas are generally bulkier with longer hair, while Eastern Lowland Gorillas have a larger build with shorter hair. Their diets also differ slightly due to the varying vegetation available in their respective habitats.

Eastern Gorilla


Eastern Gorillas are characterized by their robust build and large size, making them the largest primates in the world. They have large heads, broad chests, and long arms that can reach up to 8.5 feet (2.6 meters) in span. Their fur is predominantly black, but males develop a patch of silver hair on their back and hips when they mature, earning them the name ‘silverbacks.’

Physical differences are notable between the two subspecies. Mountain Gorillas have longer and thicker fur compared to their Eastern Lowland counterparts, which is an adaptation to the colder, high-altitude environments they inhabit.

Eastern Lowland Gorillas, living in warmer lowland forests, have shorter, finer fur. Adult males are significantly larger than females, with more pronounced bony crests on their skulls, giving them a more formidable appearance.

Habitat and Distribution

Eastern Gorillas inhabit diverse habitats in Central Africa. The Mountain Gorilla subspecies is found in the cloud forests of the Virunga Mountains, spanning the borders of the Democratic Republic of Congo, Rwanda, and Uganda. Eastern Lowland Gorillas are more widespread, inhabiting the lowland tropical rainforests in the eastern Democratic Republic of Congo.

Their habitats are characterized by dense vegetation and varying altitudes, with Mountain Gorillas living at elevations between 8,000 to 13,000 feet (2,400 to 4,000 meters), whereas Eastern Lowland Gorillas live at lower elevations.

Eastern Gorilla silverback


Eastern Gorillas are highly social animals, living in stable, cohesive groups that range in size from a few individuals to over 30. These groups are typically led by a dominant silverback, who makes decisions for the group and provides protection. The groups consist of females, their offspring, and a few younger males.

They are primarily diurnal, spending most of their day foraging for food. Their diet is predominantly herbivorous, consisting mainly of leaves, stems, bark, and fruit. Eastern Gorillas are non-territorial but have home ranges that they use for foraging.

Communication among Eastern Gorillas involves a variety of vocalizations, body postures, and facial expressions. Vocalizations can range from grunts and barks to more complex sequences of sounds, which are used to coordinate group movement, express emotions, and during social interactions.

Eastern Gorillas, especially the silverbacks, can display impressive shows of strength and aggression when threatened, but generally, they are gentle and shy animals. They have shown remarkable intelligence and emotional depth, capable of deep social bonds and empathy.

Diet and Feeding Behavior

Eastern Gorillas are predominantly herbivorous, with a diet consisting mainly of leaves, shoots, stems, bark, and fruits. Their diet varies between the subspecies due to differences in their habitats.

Mountain Gorillas, for instance, have a diet that is largely composed of foliage, including leaves, stems, and shoots, due to the limited availability of fruit in their high-altitude habitats.

Eastern Lowland Gorillas have more access to fruit in their lowland forest habitats and thus include a higher proportion of fruit in their diet.

These gorillas spend a significant part of their day foraging. They have strong, muscular jaws and large, flat teeth that are well-adapted for grinding plant material. Their foraging behavior is important for the dispersal of seeds in their habitats, contributing to forest regeneration and health.


Adult Eastern Gorillas have few natural predators due to their size and strength. However, young gorillas can be vulnerable to leopards and other large predators.

The primary threat to Eastern Gorillas comes from humans. Poaching, even though illegal, continues to be a threat, along with habitat destruction and human encroachment into their natural habitats.

Eastern Gorilla baby

Reproduction and Life Cycle

Eastern Gorillas have a slow rate of reproduction, which contributes to their vulnerability as a species. Females give birth to only one offspring at a time after a gestation period of about 8.5 months.

Newborn gorillas are completely dependent on their mothers for warmth, transportation, and nutrition. They nurse for about 3-4 years, and the interval between births can be as long as 4-6 years, as mothers invest significant care and attention in each offspring.

Young gorillas are weaned at around 3-4 years old but often remain close to their mothers until they reach maturity. Females reach sexual maturity at about 10-12 years of age, while males mature later, around 12-15 years.

Male gorillas often leave their natal groups to either live alone or join other males before attempting to form their own groups or take over existing ones.

The average lifespan of an Eastern Gorilla in the wild is around 35-40 years, although they can live longer in captivity. Their life cycle, from infancy through maturity, involves complex social interactions and learning, which are crucial for their survival and integration into the gorilla social structure.

Conservation and Threats

The Eastern Gorilla is classified as Critically Endangered by the International Union for Conservation of Nature (IUCN). The primary threats to their survival are habitat destruction, poaching, and civil unrest in their home regions.

Habitat loss due to agriculture, mining, and logging has reduced their living space significantly, while poaching, although illegal, continues to pose a serious threat.

Conservation efforts for Eastern Gorillas involve habitat protection, anti-poaching patrols, and community engagement programs. International collaborations have also been established to ensure their protection, including law enforcement, conservation education, and research.

The involvement of local communities in conservation efforts is crucial, as it provides sustainable alternatives to activities that harm gorilla populations.

Fun Facts

  1. Eastern Gorillas share about 98% of their DNA with humans, making them one of our closest relatives in the animal kingdom.
  2. Gorillas have unique nose prints, similar to human fingerprints, which researchers use to identify individuals in the wild.
  3. Despite their intimidating size, Eastern Gorillas are predominantly gentle and have been observed showing emotions like grief and compassion.
  4. Gorilla groups are led by silverback males, known for their distinctive patch of silver hair on their back and hips that develops as they mature.
  5. Eastern Gorillas build new sleeping nests each night from branches and leaves, showcasing their ability to modify their environment.

Frequently Asked Questions

What do Eastern Gorillas eat?

Eastern Gorillas are primarily herbivorous, feeding on leaves, stems, bark, and fruits. Their diet varies depending on the availability of resources in their habitat.

How long do Eastern Gorillas live?

In the wild, Eastern Gorillas can live for about 35-40 years, and sometimes longer in captivity.

Why are Eastern Gorillas endangered?

They are endangered due to habitat destruction, poaching, and the impacts of civil unrest in their natural habitats.

Can Eastern Gorillas be found in groups?

Yes, they live in groups typically led by a dominant silverback male, comprising several females and their offspring.

How can we help conserve Eastern Gorillas?

Conservation efforts include supporting habitat protection initiatives, anti-poaching measures, and organizations dedicated to gorilla conservation. Raising awareness and promoting sustainable practices in their home regions are also vital.

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