What Is the Lesula, the Monkey Species Discovered in the Congo?

The Lesula: A Primate Hidden in Plain Sight

The Lesula (Cercopithecus lomamiensis) is a species of monkey formally recognised by science in 2012, after researchers spent five years gathering evidence following a chance encounter in the Democratic Republic of Congo in 2007. It was only the second new monkey species identified in Africa in 28 years.

How Was the Lesula First Discovered?

The story begins not in a laboratory, but in a remote Congolese town called Opala. In 2007, a researcher visiting the area noticed an unusual young female monkey being kept as a pet by the family of a local school director. Her face was the giveaway — strikingly human in its proportions, with large amber eyes and bare skin that gave her an almost uncanny resemblance to a person. Scientists who saw photographs knew immediately that something extraordinary had been found.

What followed was five years of painstaking fieldwork deep in the Congo Basin rainforest — one of the most biologically rich and least explored regions on Earth. Researchers conducted field surveys, gathered specimen data, and ran comprehensive genetic analyses. Only when the evidence was overwhelming did they formally describe the Lesula as a species new to science.

Why Did the Lesula Go Viral in 2012?

When photographs of the Lesula were published in the journal PLOS ONE in September 2012, the internet erupted. That haunting, human-like face spread across every major news outlet and social media platform. People struggled to believe the animal was real. Headlines ran on every continent, and the Lesula briefly became one of the most talked-about animals in the world — a reminder that even in the twenty-first century, nature still holds secrets large enough to stop us cold.

Where Does the Lesula Live?

The Lesula is found exclusively in the Lomami Basin of the central Democratic Republic of Congo — a region so remote and densely forested that it had largely escaped systematic scientific survey. The species occupies a geographically restricted range, which makes it especially vulnerable to threats. It lives in lowland and mid-altitude rainforest, where it feeds on fruits, leaves, and other vegetation.

Is the Lesula Endangered?

Yes. The moment the Lesula was discovered, it was already in trouble. Bushmeat hunting poses a severe and ongoing threat to the species. Because its range is so small and its population geographically constrained, even moderate hunting pressure can have outsized consequences. The Lesula is currently classified as Vulnerable on the IUCN Red List.

How Did the Discovery Lead to a National Park?

The discovery of the Lesula gave conservationists powerful new ammunition. A previously unknown primate in a specific, mappable territory provided the scientific and political case for urgent protection. Advocates lobbied the DRC government, and in 2016 — just four years after the Lesula made global headlines — the Lomami National Park was officially established. The park protects not only the Lesula but an entire ecosystem of species that had been living largely undocumented by Western science.

A Reminder That Discovery Is Not Over

The Lesula’s story is a striking example of how much remains unknown, even on a planet that feels thoroughly mapped and catalogued. A pet monkey in a remote village cracked open an entire chapter of natural history. It also underscores why protecting intact, remote ecosystems matters — because what we haven’t found yet may be just as extraordinary as what we have.