Yes, all gorillas are endangered, and two of the four subspecies are critically endangered. Gorillas face threats from habitat loss, poaching, disease, and civil conflict across Central and East Africa, and their slow reproductive rate makes population recovery a generations-long process.
Four Subspecies, Four Different Situations
There are two gorilla species, each split into two subspecies, and their conservation status varies widely. The western lowland gorilla is the most numerous, with an estimated 330,000 individuals, but its population is declining by about 2.7% per year. Despite those relatively large numbers, the rate of loss earned it a Critically Endangered classification from the IUCN. The Cross River gorilla, the other western subspecies, is far rarer: at most 300 remain in the wild, scattered across rugged forests along the Nigeria-Cameroon border. These gorillas are so wary of humans that researchers primarily track them by counting abandoned nests rather than observing them directly.
On the eastern side, Grauer’s gorilla (also called the eastern lowland gorilla) has suffered the steepest collapse. Before civil war erupted in the Democratic Republic of Congo in the mid-1990s, an estimated 16,900 existed. By 2015, roughly 3,800 remained, a 77% decline in a single generation. At the hardest-hit sites, gorilla density dropped by more than 90%. That devastation pushed Grauer’s gorilla to Critically Endangered status.
Mountain gorillas are the one cautiously hopeful story. Their global population has crossed 1,000 individuals, up from a low of about 250 in 1981. They live in just two isolated pockets: the Virunga Mountains straddling the DRC, Rwanda, and Uganda, and Bwindi Impenetrable National Park in Uganda. Their IUCN status was upgraded from Critically Endangered to Endangered, a rare move in the right direction for a great ape.
Why Gorilla Populations Are Shrinking
The biggest long-term pressure is habitat loss. Central Africa’s human population is growing rapidly, and communities clear forest for agriculture and firewood. Gorillas depend on dense tropical and montane forest, and as that shrinks, populations become fragmented into smaller, more vulnerable groups.
Poaching takes multiple forms. Direct hunting of gorillas for bushmeat is less common for mountain gorillas but remains a real threat for lowland species. More insidious is snare hunting: traps set for antelope or bush pigs regularly injure or kill gorillas that stumble into them. In the Virunga region alone, field staff confiscate more than 1,500 snares per year. There have also been documented cases of gorilla infants being captured for the illegal live animal trade, with adults killed in the process.
Civil conflict has been especially destructive for eastern gorillas. The Rwandan genocide in 1994 and years of war in the DRC drove waves of refugees into areas bordering gorilla habitat. National parks became battlegrounds and shelters for armed militias, making conservation work dangerous or impossible. The 94% average decline in gorilla numbers at surveyed sites in eastern DRC between 1994 and 2015 tracks almost perfectly with the timeline of regional conflict.
How Ebola Reshaped Western Gorilla Populations
Ebola has been catastrophic for gorillas. The virus is estimated to have killed roughly one-third of the global gorilla population. At study sites near human Ebola outbreak zones, western lowland gorilla populations declined by 56% to 98%. Seven Ebola outbreaks were documented in great ape populations between 1992 and 2003, and researchers have estimated a nearly 64% annual chance of the virus infecting a susceptible great ape population in any given year.
Gorillas are vulnerable to many human diseases because of their close genetic relationship to us. A respiratory virus that causes mild symptoms in people can devastate a gorilla group encountering it for the first time. This means even well-intentioned human contact, from researchers, tourists, or local communities, carries risk. Recovery from disease-driven losses is predicted to take decades at a population level, with genetic impacts potentially persisting for centuries.
Why Recovery Takes So Long
Gorillas reproduce slowly. Females typically don’t give birth again for about five years after a successful birth, and the upper limit of that interval can stretch to nearly eight years. Females stop reproducing around age 35, and the average generation time for Grauer’s gorillas is 20 years. Even under ideal protected conditions, the best documented inherent growth rate for western gorillas is about 0.7% per year. Compare that to the 2.7% annual decline across the species, and the math is sobering: gorillas simply cannot breed fast enough to outpace the threats they face without human intervention.
What Has Worked for Mountain Gorillas
The mountain gorilla recovery from 250 individuals to over 1,000 is one of conservation’s most studied success stories, and it required far more than just creating protected areas. Starting in the 1980s, a combination of law enforcement patrols, community education, ecotourism, and a pioneering veterinary program was deployed across the Virunga region. The population grew to 320 by 1989, but that was only the beginning.
The strategy that made the biggest difference was what researchers call “extreme conservation”: continuous daily monitoring of each habituated gorilla group by dedicated field staff during all daylight hours, paired with veterinary treatment for snare injuries, respiratory disease, and other life-threatening conditions. The Virunga parks now maintain more than 50 field staff per 100 square kilometers, over 20 times the global average for protected areas. Veterinary care alone may account for up to 40% of the growth rate difference between gorilla groups that receive this monitoring and those that don’t, with the rest attributed to better protection from poachers.
In the Virunga Massif specifically, the population grew from 480 individuals in 2010 to 604 in the most recent census. These results suggest that standard conservation measures like law enforcement can prevent severe decline, but active, hands-on management is needed to achieve actual population growth. The approach is expensive and labor-intensive, which raises hard questions about whether it can scale to protect the hundreds of thousands of western lowland gorillas spread across vast, often conflict-affected forests in Central Africa.
Where Each Subspecies Stands Now
- Western lowland gorilla: Critically Endangered. Around 330,000 individuals but declining at 2.7% per year from poaching, Ebola, and habitat loss.
- Cross River gorilla: Critically Endangered. Fewer than 300 remain in fragmented forest along the Nigeria-Cameroon border.
- Grauer’s gorilla: Critically Endangered. Approximately 3,800 left after a 77% collapse driven by civil war and its aftermath.
- Mountain gorilla: Endangered. Over 1,000 individuals, the only subspecies with a growing population, thanks to intensive conservation efforts.
The mountain gorilla’s recovery proves that gorilla populations can rebound with sustained, well-funded protection. But it also reveals the scale of commitment required. Every habituated group needs its own team of guards, its own veterinary oversight, and a surrounding community that benefits economically from the gorillas’ survival. For the three critically endangered subspecies, the gap between what’s needed and what’s currently in place remains enormous.