Gorilla

Gorilla facts at a glance

How big is a gorilla?

An adult gorilla measures 1.7 m long — about 98% of the height of an average adult person (1.73 m) — and weighs around 200 kg, about 2.9× an average adult’s body weight (70 kg).

What is a group of gorillas called?

Explore more animal collective nouns and baby animal names .

Intelligence and social life

Gorillas live in stable family groups led by a single dominant male called a silverback, named for the silver hair across his back. They are remarkably intelligent: they use tools, recognize themselves in mirrors, and some captive gorillas have learned hundreds of sign-language gestures. Group members communicate through more than 20 distinct vocalizations.

Diet and strength

Gorillas are mostly herbivores, eating leaves, stems, shoots, fruit, and occasionally insects. An adult can eat up to 18 kg (40 lb) of vegetation a day. Despite their plant-based diet, silverbacks are extraordinarily strong, capable of lifting many times their own body weight, though they rarely use that strength aggressively.

Habitat and range

Gorillas live only in the tropical and montane forests of central Africa, split into western and eastern species. They build a fresh nest of branches and leaves to sleep in each night, on the ground or in trees, and travel through their home range feeding as they go.

Conservation

Both gorilla species are endangered, and the western lowland gorilla is Critically Endangered, threatened by poaching, disease such as Ebola, and habitat loss from logging and mining. Conservation programs, protected parks, and carefully managed gorilla tourism are central to their survival.

Social groups

Gorillas live in stable family groups led by a dominant adult male known as a silverback, named for the silver hair across his back. The silverback makes decisions, mediates conflicts, and protects the group, which usually includes several females and their young.

Diet and intelligence

Gorillas are mainly herbivores, eating leaves, stems, shoots, and fruit, and they are highly intelligent. Some have learned sign language in captivity, and wild gorillas have been seen using simple tools such as sticks to test the depth of water before crossing.

Did you know? Gorilla facts

• Gorillas are the largest living primates, with silverback males reaching up to ~200 kg.
• They share roughly 98% of their DNA with humans.
• A dominant 'silverback' male leads and protects each family group.
• Despite their power, gorillas are largely peaceful herbivores that avoid conflict.
• Gorillas build a fresh nest of vegetation to sleep in almost every night.
• They have been observed using simple tools, such as a stick to test water depth.
• Both mountain gorilla and the larger eastern lowland gorilla are threatened with extinction.

Diet & feeding

Gorillas are predominantly herbivorous, eating leaves, stems, shoots, and pith, with western lowland gorillas taking substantial fruit; an adult may consume many kilograms of vegetation daily.

Adaptations

• Massive jaw muscles and a sagittal crest power a bite that processes tough, fibrous vegetation. (Schaller 1963)
• Long, powerful arms and a robust build suit knuckle-walking and occasional climbing.
• A large gut hosts the microbes needed to ferment a high-fibre leaf-and-stem diet.
• The silverback's size and silver saddle signal dominance and deter rivals without fighting.

Behaviour & ecology

• Family groups are led by a silverback who mediates disputes and decides daily movement. (Fossey 1983)
• Chest-beating and display are used to settle contests with minimal physical fighting.
• Gorillas construct new sleeping nests nightly from bent vegetation.
• Strong mother–infant bonds and extended care underpin slow reproduction.

Communication

• Around two dozen distinct vocalisations include grunts, hoots, and alarm barks. (Schaller 1963)
• The silverback's chest-beat is an audible-and-visual long-distance display.
• Facial expressions, postures, and gestures convey mood and intent within the group.

Habitat & range

Gorillas inhabit tropical and montane forests of equatorial Africa — western gorillas in the Congo Basin lowlands, eastern and mountain gorillas in the forests and volcanoes of the Albertine Rift.

Ecological role

As large frugivore-folivores, gorillas disperse seeds and shape forest structure through feeding, contributing to the regeneration and diversity of African rainforests.

Conservation status of the Gorilla

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Gorilla:

• IUCN Red List of Threatened Species

  Conservation status (Critically Endangered) reflects the IUCN Red List category for Gorilla gorilla, most recently assessed in 2016.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Gorilla gorilla. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Gorilla gorilla. Explore published occurrence records used in range research.

• Hickey, J. R. et al. (2020). Gorilla gorilla. The IUCN Red List of Threatened Species.

  Status (Critically Endangered, western gorilla).

• Schaller, G. B. (1963). The Mountain Gorilla: Ecology and Behavior. University of Chicago Press.

  Pioneering field study.

• Fossey, D. (1983). Gorillas in the Mist. Houghton Mifflin.

  Long-term mountain gorilla observation.

• Nowak, R. M. (1999). Walker's Mammals of the World (6th ed.). Johns Hopkins University Press.

  Morphology and measurements.

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.