Virunga: Mafuko’s rare twin mountain gorillas

On the damp slopes of the Virunga mountains, where mist blankets the landscape at dawn, an exceptionally rare sighting has startled researchers.

Amid ancient trees and the forest’s muted sounds, a female mountain gorilla has been seen in a scene few people would ever expect to witness. The moment, recorded by field teams accustomed to surprises, has implications for figures, statistics and, above all, the survival prospects of one of the planet’s most threatened species.

A sight almost never seen among mountain gorillas

In a clearing in Virunga National Park, in the Great Lakes region on the border of the Democratic Republic of the Congo, Rwanda and Uganda, 22-year-old female Mafuko was spotted holding two newborn infants.

It was January 2026. Rangers initially questioned what they were seeing. They used binoculars, moved closer with great care and confirmed that the two babies were male, only a few days old and from the same litter.

The birth of twins in mountain gorillas is so uncommon that it accounts for only around 1% of documented births.

For a species that already breeds very slowly, twin births are close to a statistical anomaly. Female mountain gorillas generally produce one infant every four years on average. Many have only three or four offspring during their entire lives.

According to data compiled by organisations including the Dian Fossey Gorilla Fund, multiple pregnancies barely feature in historical records. In Virunga itself, the last confirmed twin birth had been recorded in 2020. Before that, Mafuko had twins in 2016, but both infants died within a few days.

Why a twin pregnancy is so demanding for the mother

Caring for twins is already a physical and mental challenge for a human. For a gorilla living on steep ground, in frequent rain, surrounded by dangers and travelling long distances each day, the effort is multiplied.

Mountain gorillas move using all four limbs. Even when carrying one infant, a mother must adjust her posture to keep one arm free while supporting the baby’s weight. With two babies, the practical challenge becomes almost acrobatic.

• Every journey requires frequent stops to readjust the infants’ positions.
• Any fall or stumble could injure one or both babies.
• Opportunistic predators and conflict between groups increase the danger to the young.
• The mother expends more energy, increasing her food requirements in an already contested environment.

Breastfeeding adds another difficulty. Producing enough milk for one infant already places substantial demands on a female. For two, the energy requirement rises dramatically. Primatologists such as Tara Stoinski, cited in international reports, note that this physiological strain is linked to the low survival rates of twins in gorillas.

Among gorillas in nearby regions, about one third of infants die before reaching adulthood, even following single births.

During Mafuko’s first days with the twins, park teams increased their patrols, watching from a distance, documenting behaviour and preparing minimum-intervention protocols should the situation become critical. The priority is to let nature take its course, while recognising that every individual matters to the species’ future.

Virunga: a sanctuary under pressure from conflict and poachers

Virunga is more than a beautiful park on a map. Established in the early 20th century, it is Africa’s oldest nature reserve and a UNESCO World Heritage Site. It contains volcanoes, montane forests and wetlands, as well as elephants, hippos, chimpanzees and, naturally, the renowned mountain gorillas.

At the same time, much of the territory exists under continual strain. Armed militias, including the M23 group, compete for strategic areas, exploit natural resources and threaten local communities. Virunga’s rangers work armed, not by choice but through necessity.

The global mountain gorilla population’s rise from fewer than 700 to more than 1,000 animals in just over a decade was not accidental. It followed investment in monitoring, veterinary care, efforts against wildlife trafficking and dialogue with communities living around the park.

Mafuko, the orphan who became a symbol of resilience

Mafuko’s history helps explain why these twins have attracted so much attention. Orphaned at the age of four, she survived an attack linked to human presence. She was later incorporated into a new group, known as the Bageni family.

Since then, the female has had seven offspring, including the 2026 twins. In a setting affected by illegal hunting, disease and habitat loss, a gorilla capable of producing so many descendants becomes central to the population’s genetic dynamics.

Mafuko’s twins do not simply represent a rare event; they serve as a living test of how far the species can adapt under pressure.

For those responsible for the park, every birth strengthens the case that conserving Virunga is not merely a local concern. It means safeguarding an entire lineage of great apes, which share with humans complex social behaviour, a capacity to learn and even signs of grief.

What this birth changes for gorilla conservation

One pair of twins will not, by itself, transform global statistics. Nevertheless, events like this can create a ripple effect.

First, they draw media attention to an area that usually appears in the news only because of armed conflict. They can then help secure funding for field projects, which is essential to keep rangers, veterinarians and research teams operating in a dangerous, remote region.

In practical terms, a twin birth can encourage new research avenues:

• Studies into the physiology of females able to sustain multiple pregnancies.
• Genetic analyses to establish whether there is a hereditary factor associated with twinning.
• Detailed monitoring of the two infants’ development, compared with single-born babies.
• Assessment of the additional effort’s impact on the mother’s long-term health.

Such information can help improve management protocols, set priorities for emergency action and even inform decisions in other parks that support smaller gorilla populations.

Concepts that help explain the case

Two terms frequently arise in discussions of mountain gorillas and deserve closer attention: reproductive rate and infant mortality.

A low reproductive rate means the species takes a long time to recover from any loss. If an adult is killed by poachers, it cannot simply be “replaced” by a birth. The calculation is far slower. A female needing four years or more between infants adds relatively few new lives to the population throughout her lifetime.

High infant mortality, meanwhile, acts as a constant brake. When one third of infants do not survive to adulthood, every circumstance that raises the risk of loss - such as carrying twins across hazardous terrain - becomes a major concern. This is why biologists are following Mafuko’s case almost day by day, recording progress and warning signs.

What might happen to the twins in the years ahead

If all goes well, the two males should pass through clearly defined stages. During their first months, they will remain clinging to their mother almost constantly. Later, they will begin to crawl, climb low branches and interact with siblings and other group members.

Adolescence in gorillas brings behavioural changes and struggles for hierarchy. In many cases, young males leave their natal group and seek to establish their own bands. A pair of twin brothers could, in theory, remain together at this stage, forming an unusual alliance that might influence future social structures within the population.

For people following the species’ conservation, considering such scenarios is not merely an exercise in curiosity. Simulations of this kind help with long-term planning: how many groups the park can support, which areas require greater protection and how many individuals of breeding age live in each region.

Ultimately, the sight of these two small gorillas in Mafuko’s arms is a powerful reminder: even in an area marked by violence, weapons, militias and pressure on nature, life still finds openings in which to persist. It falls to humans to decide whether those openings will widen or close for good.