While they never rivaled the mythic King Kong, the largest gorillas recorded were formidable beasts that left a lasting impression on those who encountered them.
The tallest verified wild gorilla measured 6 feet, 4 ¾ inches. This male, captured by hunters near Alimbongo in 1938—today’s Democratic Republic of the Congo—remains the tallest documented gorilla. Although not the heaviest, the record for wild weight belongs to a 482‑pound male found near Lake Kivu in 1929. Numerous anecdotes from hunters describe gorillas weighing up to 588 pounds, but these figures are unverified.
Captivity has produced even larger individuals. The heaviest documented gorilla, a male named N’gagi at the San Diego Zoo, weighed 636 pounds before his death in 1944. All three record holders were eastern gorillas.
Gorillas belong to two species: the western gorilla (Gorilla gorilla) and the eastern gorilla (Gorilla beringei). The eastern species splits into two subspecies—Grauer’s gorillas (G. b. graueri) and mountain gorillas (G. b. beringei). The 2001 taxonomic revision clarified that the record‑setting animals were most likely Grauer’s gorillas, or eastern lowland gorillas, which are not only the largest gorillas but the largest primates alive today.
Eastern lowland gorillas thrive in the eastern Democratic Republic of the Congo. Mature silverback males typically stand 5–6 feet tall and weigh between 220 and 460 pounds, surpassing the average U.S. adult male, who is 5 ft 9 in and weighs about 200 pounds (CDC).
By comparison, the heaviest human ever recorded—Jon Brower Minnoch—reached 1,400 pounds, but 80 % of that mass was adipose tissue. Gorillas, with only ~20 % body fat, accumulate most of their mass in muscle, explaining their exceptional strength.
Eastern lowland gorillas exhibit pronounced sexual dimorphism. Females rarely exceed 215 pounds, while male size can vary substantially; dominant alpha males often attain larger physiques, reflecting the link between size and mating priority.
Despite their imposing stature, eastern gorillas face the greatest threat from human activity. With an estimated 2,600 mature individuals in the wild, the eastern gorilla is classified as Critically Endangered on the IUCN Red List. Grauer’s gorillas have lost more than 85 % of their historic range, and populations continue to dwindle.
Primary drivers of decline include habitat loss driven by logging, mining, and conversion of forest to agriculture. The World Resources Institute reports that the Democratic Republic of the Congo has the third‑highest deforestation rate worldwide, largely due to illegal logging.
Prolonged conflict in the DRC has exacerbated the crisis. Since the 1990s, widespread violence has driven many to rely on bushmeat for survival, leading to increased poaching of gorillas. Conservation efforts struggle to operate in conflict zones, making routine monitoring and protection exceedingly difficult.
