Volcanoes National Park gorilla weight 

Volcanoes National Park Gorilla Weight — How Heavy Are Rwanda’s Mountain Gorillas? (2026)

Volcanoes National Park gorilla weight:  The mountain gorillas of Volcanoes National Park (Parc National des Volcans) in Rwanda are mountain gorillas. An adult male silverback weighs approximately 140–230 kg (300–500 lbs), while adult females weigh approximately 70–115 kg (150–250 lbs) — roughly half the male weight.

Volcanoes National Park protects over 600 mountain gorillas across 12+ habituated families available for trekking, including the famous Susa family (one of the largest, 28+ members) and the historic research site of Dian Fossey’s Karisoke Research Centre. Standing height for an upright silverback is approximately 1.7m.

Rwanda gorilla trekking permits cost USD $1,500 per person. For mountain gorilla safaris in Uganda and Rwanda, Contact us to start planning.

Volcanoes National Park — known in French as Parc National des Volcans — sits in north-western Rwanda on the slopes of the Virunga Massif, a chain of dormant and extinct volcanoes shared by Rwanda, Uganda, and the Democratic Republic of Congo.

It is one of only a handful of places on Earth where the critically endangered mountain gorilla survives in the wild, and one of the most famous because it was here that primatologist Dian Fossey conducted her pioneering decades-long study of mountain gorilla behaviour.

Anyone planning a Volcanoes National Park gorilla trek inevitably wants to know one thing first: exactly how big and how heavy are these animals?

This guide gives you the full picture of Volcanoes National Park gorilla weight — male and female weight ranges, how mountain gorillas compare to other gorilla subspecies, the famous habituated families you might trek, and what that extraordinary size and weight means for strength and safety on a gorilla trek.

We also cover practical trekking information through Hail Tours Uganda, a licensed operator running gorilla safaris in both Uganda and Rwanda.

Best Places to See Gorillas

How Much Does a Mountain Gorilla in Volcanoes National Park Weigh?

Every mountain gorilla in Volcanoes National Park belongs to the subspecies Gorilla beringei beringei — the same population shared across the Virunga Massif spanning Rwanda, Uganda’s Mgahinga Gorilla National Park, and the DRC’s Virunga National Park.

Like all gorillas, mountain gorillas show pronounced sexual dimorphism — adult males weigh roughly twice as much as adult females:

Age / Sex Category Typical Weight Notes
Newborn infant ~1.8–2.0 kg (4–4.5 lbs) Born after an 8.5-month gestation; clings to mother’s fur from birth
Juvenile (3–6 years) ~15–35 kg (33–77 lbs) Active climbing and play phase; still nursing in early years
Sub-adult male (blackback, 8–12 yrs) ~70–120 kg (155–265 lbs) Back hair still dark; not yet fully mature
Adult female (mature) ~70–115 kg (150–250 lbs) Reaches full adult size around age 10
Adult male — silverback (12–15+ yrs) ~140–230 kg (300–500 lbs) Distinctive silver-grey saddle of hair develops across back and hips
Largest recorded Virunga silverbacks Up to ~220 kg+ (485 lbs+) in the wild Older, dominant males in good condition can reach the top of the range

A fully mature silverback in Volcanoes National Park typically stands approximately 1.4–1.8 metres (4.6–5.9 feet) tall when upright — though gorillas spend most of their time on all fours (knuckle-walking) rather than standing, so their crouched everyday posture is considerably lower.

Their arm span often exceeds 2 metres, far longer than their standing height, and their chest circumference can reach 1.5–1.7 metres — roughly 50–60% larger than an average adult man’s chest.

Why mountain gorillas are slightly smaller than eastern lowland gorillas:  Mountain gorillas like those in Volcanoes National Park (140–230 kg) are typically a touch lighter on average than their cousin the eastern lowland gorilla (Grauer’s gorilla, 180–225 kg), which lives in DRC’s lowland forests with year-round abundant fruit.

Mountain gorillas live at higher altitude (2,500–4,500m) with a more seasonal, fibrous diet of leaves, stems, and bamboo — and compensate with a thicker fur coat rather than greater body mass.

Volcanoes National Park’s Habituated Gorilla Families and Their Size

Volcanoes National Park is home to over 600 mountain gorillas, with 12 or more habituated families available for tourist trekking in 2026 — each with its own dominant silverback, social dynamics, and typical trek difficulty. Some of the most famous:

  • Susa Family: One of the largest gorilla families in Volcanoes National Park, historically with 28+ members and multiple silverbacks. Famous as one of the first families habituated under Dian Fossey’s original research. The dominant silverback in a family this size is typically toward the upper end of the 140–230 kg weight range. Treks to Susa can be longer (2–6 hours) due to their higher-elevation range
  • Sabyinyo Family: Home to Guhonda — long considered one of the largest and most powerful silverbacks in Rwanda, estimated well above 200 kg at his peak. Sabyinyo is also one of the more accessible families, located at lower elevation
  • Amahoro Family: Known for calm temperament (“amahoro” means peace in Kinyarwanda); a good family for trekkers wanting an easier, shorter encounter with a typically sized silverback
  • Agashya (Group 13) Family: Led by a silverback with a dramatic history of takeovers; an active, sometimes higher-energy family to trek
  • Hirwa Family: A relatively young family, often found near the park boundary, making for shorter treks

Your specific family assignment on trek day is made by Rwanda Development Board rangers based on permit allocation and the previous evening’s tracking reports — not by individual choice. Hail Tours Uganda arranges Rwanda gorilla permits alongside our Uganda safaris; see our full Uganda safari itinerary price guide for combined Uganda-Rwanda primate trip costings.

Mountain Gorilla Weight vs Other Gorilla Subspecies

Understanding how mountain gorilla weight compares to other gorilla subspecies puts Volcanoes National Park’s gorillas in context:

Gorilla Subspecies Adult Male Weight Adult Female Weight Where Found
Mountain gorilla (Virunga population) 140–230 kg (300–500 lbs) 70–115 kg (150–250 lbs) Volcanoes NP (Rwanda), Mgahinga NP (Uganda), Virunga NP (DRC)
Mountain gorilla (Bwindi population) 140–230 kg (300–500 lbs) 70–115 kg (150–250 lbs) Bwindi Impenetrable Forest, Uganda
Eastern lowland gorilla (Grauer’s) 180–225 kg (400–500 lbs) 70–110 kg (150–240 lbs) Eastern DRC lowland forest only
Western lowland gorilla 140–180 kg (300–400 lbs) 70–90 kg (150–200 lbs) Cameroon, Gabon, Congo-Brazzaville, CAR

Note that the mountain gorilla population is itself split into two genetically related but geographically separate groups: the Virunga Massif population — found in Volcanoes National Park, Uganda’s Mgahinga Gorilla National Park, and DRC’s Virunga National Park — and the Bwindi population in Uganda’s Bwindi Impenetrable Forest.

Both share the same weight range and species classification, though they are genetically distinct enough that some researchers have proposed they could eventually be classified separately.

For trekkers comparing destinations, Uganda’s Bwindi offers more habituated families (19+) at a lower permit cost ($700) than Rwanda’s Volcanoes National Park ($1,500) — see our full best Uganda safari itinerary guide for Uganda gorilla options.

Silverback Strength — What a 200kg Gorilla Can Actually Do

The extraordinary weight of a Volcanoes National Park silverback translates into physical strength far beyond anything a human can match. A mature silverback weighing 180–230 kg is estimated to be 4 to 9 times stronger than an adult human pound-for-pound, capable of lifting in excess of 1,800 lbs (815 kg) — more than four times the human deadlift world record — and exerting a bite force of roughly 1,300 PSI compared to a human’s 120–160 PSI.

This strength comes almost entirely from a diet of leaves, stems, and bamboo shoots — gorillas are predominantly herbivorous, yet build and maintain enormous, dense muscle mass through sheer volume of plant intake, often 18–20 kg of vegetation per day.

Despite this raw power, gorillas in Volcanoes National Park are gentle, family-oriented animals. A silverback charge — which trekkers occasionally witness — is almost always a “bluff charge” display (chest-beating, hooting, a short rush that stops well short of contact) rather than a genuine attack, and properly conducted gorilla trekking with experienced rangers remains one of Africa‘s safest wildlife encounters.

Trekking Mountain Gorillas — Volcanoes National Park vs Uganda

For travellers deciding where to trek mountain gorillas and see this extraordinary weight and size up close, both Rwanda’s Volcanoes National Park and Uganda’s gorilla parks offer world-class experiences:

Rwanda — Volcanoes National Park

  • Permit cost: USD $1,500 per person per trek
  • Habituated families: 12+ available, including the famous Susa and Sabyinyo families
  • Access: Closest gorilla park to an international airport — Kigali is roughly 2–3 hours’ drive
  • Historic significance: Home to Dian Fossey’s Karisoke Research Centre and her grave, accessible via a dedicated hike

Uganda — Bwindi Impenetrable Forest and Mgahinga

  • Permit cost: USD $800 per person per trek — less than half Rwanda’s price
  • Habituated families: 19+ across four Bwindi sectors, plus Mgahinga’s Nyakagezi family in the Virunga foothills
  • Combination potential: Easily paired with chimpanzee trekking in Kibale Forest, Big Five game drives in Queen Elizabeth or Murchison Falls, and golden monkey trekking

Hail Tours Uganda arranges gorilla trekking permits and full itineraries for both countries. See our all Uganda safari packages page to browse gorilla trekking and combined wildlife safari options, or our Uganda safari itinerary price guide for a complete cost breakdown across budget, mid-range, and luxury tiers. Learn more about our company at hailtoursuganda.com/about-hail-tours-uganda/.

Plan Your Gorilla Trekking Safari — Hail Tours Uganda

Whether you choose Rwanda’s Volcanoes National Park or Uganda’s Bwindi Impenetrable Forest to witness these extraordinary 140–230 kg mountain gorillas in the wild, Hail Tours Uganda organises fully licensed, professionally guided gorilla safaris with permit booking handled on your behalf.

Browse our safaris: All Uganda safari packages · Uganda safari itinerary price guide · About Hail Tours Uganda · WhatsApp: +256 774 711 658 · Email: info@hailtoursuganda.com

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