Likweli: The New Congo Monkey Species with a Striking Mask-Like Face

Quick Answer: Likweli, scientifically named Colobus congoensis, is a newly described species of African colobus monkey from Lomami National Park in the Democratic Republic of the Congo. Researchers combined field observations, anatomy, mitochondrial genetics, vocalizations, and local knowledge to confirm it as distinct from other known colobus monkeys.

An illustrative depiction of Likweli, a newly described Congo monkey species in its forest habitat, inspired by the documented scientific discovery and description of the species. Illustration: The Pader.

Introduction

Deep in the forests of the Democratic Republic of the Congo, scientists have formally described a monkey that had remained largely hidden from science for years. Known locally as Likweli, the animal has now been given the scientific name Colobus congoensis.

The discovery is unusual not because the monkey suddenly appeared, but because researchers had to gather enough evidence to show that a population already living in the forest represented a distinct species. The first clue came from a blurry photograph in 2008. A clearer encounter in 2018 led to a much larger investigation that combined field surveys, recordings, museum specimens, genetics, and community knowledge.

The researchers and supporting institutions describe Likweli as the fifth new African monkey species identified in the past 75 years. The figure is presented here as a reported research characterization, not as a claim that no other primate discoveries have occurred outside that definition.

SPECIES PROFILE

Likweli

Colobus congoensis

TYPE African colobus monkey; Old World primate

RANGE Lomami-Lualaba interfluve, east-central Democratic Republic of the Congo

KNOWN RANGE About 1,700 km²

BODY MASS About 6.8 kg (15 lb)

DISTINCTIVE FEATURES Black pelage, orange-cream facial patch, long tail and white perianal patch

KNOWN OBSERVATIONS 114 detections recorded from 2018–2022

CONSERVATION STATUS Researchers propose a preliminary Endangered classification

The species is formally recognized in current taxonomic databases. Its common name, Likweli, comes from local usage documented by the researchers. Image: ZGF / Daniel Rosengren via Wikimedia Commons, CC BY-SA 4.0.

A New Species to Science, Not a New Animal to the Forest

Calling Likweli a “newly discovered” monkey can be misleading if it sounds as though the animal has just evolved or appeared. The researchers are describing a species that was already living in the Congo Basin and was known to at least some local communities.

The scientific discovery was the formal recognition that this population is distinct from other known Colobus monkeys. The study published in PLOS ONE in July 2026 used several independent lines of evidence, including morphology, mitochondrial DNA and vocalizations. The researchers also examined museum specimens and documented observations from the field.

That combination matters because species identification is not based on unusual appearance alone. The evidence showed that C. congoensis has a distinctive set of physical characteristics and genetic relationships that separate it from its closest known relatives.

The Search Began With a Blurry Photograph in 2008

The story began during wildlife surveys in what is now Lomami National Park. In 2008, researchers photographed an unfamiliar black monkey high in the forest, but the image was too unclear to settle its identity.

A much clearer encounter came in November 2018, when field researcher Jean-Pierre Kapale obtained photographs showing the monkey's face, body and tail. Those images helped trigger a dedicated search for the animal.

From 2018 to 2022, researchers recorded 114 detections. Some were visual observations, while others were based mainly on vocalizations. The team also interviewed people in 52 villages near the species' known range. Only eight of those surveyed localities had people who could recognize and accurately describe the monkey.

This local knowledge became an important part of the investigation. Balanga communities used the name Likweli, while Mituku communities used another local name meaning “branch shaker.” The researchers recommend Likweli as the species' common name.

What Makes the Likweli Look Different?

Likweli is mostly covered in black fur, but its face has unusually pale and orange-cream areas around the mouth and parts of the nose and eye region. These markings stand out strongly against the otherwise dark face and are responsible for the animal's often-described mask-like appearance.

The species also has a long, mostly black tail, relatively short mid-dorsal hair compared with the black colobus, and a distinctive white patch around the anal region. Researchers found that its skull and teeth also differ from those of other Colobus species.

One especially important distinction is size. The researchers describe C. congoensis as smaller in body mass and cranial size than the other Colobus species examined. Reports based on the study place its body mass at about 6.8 kilograms, or 15 pounds.

Its Closest Known Relative Lives More Than 1,200 Kilometers Away

Genetic analysis identified the black colobus, Colobus satanas, as Likweli's closest known relative. The two species are geographically separated by more than 1,200 kilometers.

The study's mitochondrial analysis estimates that their lineages diverged millions of years ago. The fossil-calibrated estimate for their most recent common ancestor falls at roughly 4.3 to 5.8 million years ago, showing that the two monkeys represent an old evolutionary split rather than a recent separation.

It Lives High in the Forest Canopy

The known range of C. congoensis covers about 1,700 square kilometers in the Lomami-Lualaba region of east-central DRC. The species has been recorded mainly in high, closed-canopy forest, including forest growing on deep clay pediments and islands of relatively dry terra firme forest.

The restricted range is one reason the species has attracted conservation attention. Researchers recorded the monkey primarily in mature forest canopy or middle levels. They also found that it frequently appeared in mixed-species primate groups rather than living only in single-species groups.

A Monkey You May Hear Before You See

Likweli has another unusual feature: its vocalizations. The species produces loud roars that can be distinguished from the calls of other colobus monkeys by acoustic characteristics including a rapid pulse rate and a distinctive snort between sequences.

Researchers analyzed recordings from the field and found that Likweli's vocalizations were structurally closest to those of the black colobus. This acoustic evidence added another independent line of support for the species' distinct identity.

The researchers also noted that many observations were made through sound rather than clear visual contact. That fits the animal's reputation as a cryptic canopy species that can be difficult to photograph.

Why the Species Is Already a Conservation Concern

The formal description of a new species does not automatically mean that it is legally protected under a particular threatened-species category. In Likweli's case, the researchers proposed a preliminary classification of Endangered for future IUCN Red List assessment.

The proposed classification is based on the species' small known range, low encounter rates and the potential effects of habitat conversion and increased hunting pressure. Most of the known range occurs within Lomami National Park, but the surrounding buffer zone is also important because people depend on the landscape for activities including hunting, fishing and shifting cultivation.

The study does not establish that the species has already suffered a documented population collapse. Instead, it highlights the vulnerability created by its restricted distribution and the possibility that future habitat loss or hunting pressure could become increasingly important.

Why This Discovery Matters

Likweli's story illustrates how much can remain undocumented even in a landscape that has been studied for decades. The monkey was not unknown to every person living near its range, but it was unknown to formal science as a distinct species until researchers assembled enough evidence to describe it.

It also shows why modern species discovery can involve much more than finding an unusual-looking animal. Field observations, local ecological knowledge, anatomy, genetics and sound recordings each contributed a different part of the evidence.

For the Congo Basin, the discovery adds another formally recognized species to one of the world's most biologically important tropical forest regions. For conservationists, it also provides a clearer scientific basis for monitoring a monkey whose known distribution is unusually limited. The story forms part of The Pader's broader Amazing Animal Stories collection.

Takeaway

Likweli, or Colobus congoensis, is a genuine new species to science, formally described in 2026 after years of fieldwork and analysis. Its black coat, orange-cream facial markings, distinctive roar and restricted forest range make it unusual, but the deeper significance of the discovery is scientific: researchers were able to demonstrate through multiple independent lines of evidence that this little-known Congo Basin monkey represents a distinct evolutionary lineage.

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Sources and Further Reading