Scientists have identified a new monkey species with striking orange lips in the Democratic Republic of Congo after it spent years hiding in a remote forest
Scientists have officially identified a previously unknown monkey species with vivid orange lips in the remote rainforests of the Democratic Republic of Congo (DRC), ending years of scientific uncertainty over whether the small, isolated population represented a distinct species. The scientific findings have been published in the journal PLOS One.Named Colobus congoensis, the monkey stands out for its striking orange lips, mask-like facial markings and distinctive vocalisations. According to researchers, it is one of the rare instances in recent decades in which a new monkey species has been formally described, and it provides new insights into the evolutionary history of African colobus monkeys.The study was led by an international team of scientists from who spent years studying the mysterious monkeys in the central Congo Basin. Although local communities were already familiar with the animals, researchers needed extensive field observations, detailed physical comparisons and modern DNA analysis before they could confirm that the population represented a species previously unknown to science. According to the research published in PLOS One, the monkey belongs to the black-and-white colobus group but possesses a unique combination of physical, behavioural and genetic characteristics that distinguish it from all known relatives. Genetic analyses showed that the population is evolutionarily distinct, providing strong evidence that it should be recognised as a separate species rather than a local variation of an existing one.Among its most eye-catching features are its bright orange lips, bold facial markings and characteristic roaring and snorting calls. According to researchers, these unique traits, together with its DNA, clearly separate Colobus congoensis from neighbouring colobus populations. The species also occupies a relatively restricted range within the Democratic Republic of Congo, adding to its scientific importance.
Image Credit: Daniel Rosengren, Frankfurt Zoological Society via X/ @FloridaAtlantic
The discovery is particularly remarkable because primates are among the world’s most thoroughly studied mammals. Finding an entirely new monkey species in the 21st century is exceptionally uncommon and highlights how much remains unknown about biodiversity in some of the planet’s least accessible forests.The Congo Basin, where the monkey was found, is the second-largest tropical rainforest on Earth after the Amazon. Spanning several Central African countries, it is home to thousands of plant and animal species, including bonobos, gorillas, forest elephants and okapis. Yet vast areas of the forest remain poorly explored because of dense vegetation, difficult terrain and limited infrastructure.Researchers suggest the population became genetically distinct after long periods of geographic isolation, likely caused by natural barriers such as rivers and changing landscapes. Over time, this isolation allowed the animals to develop distinctive physical features and genetic differences that eventually resulted in the emergence of a separate species.Confirming the discovery required much more than simply spotting an unusual monkey. The research team combined years of fieldwork with detailed anatomical comparisons and advanced genetic testing. DNA sequencing proved especially important in demonstrating that the population represented a distinct evolutionary lineage. According to the findings published in PLOS One, integrating traditional field observations with modern molecular techniques has become increasingly important for identifying cryptic species – animals that may appear similar to known species but are genetically distinct.The findings also carry important conservation implications. The authors recommend assessing Colobus congoensis as Endangered under the IUCN Red List criteria, as the species appears to have a limited distribution and faces growing threats from habitat destruction and hunting. Protecting the forests where it survives will be essential to ensuring its long-term future.Like many parts of the Congo Basin, the monkey’s habitat is under increasing pressure from logging, mining, agricultural expansion and other human activities. Conservationists warn that species with small geographic ranges are often the most vulnerable because even limited habitat loss can have a significant impact on their populations.The discovery also serves as a reminder that Earth still harbours remarkable wildlife waiting to be documented. Scientists believe many remote forests continue to shelter species that have escaped scientific recognition, particularly in regions where political instability or challenging terrain have limited biological surveys. Researchers hope the identification of Colobus congoensis will encourage further scientific exploration of the Congo Basin and strengthen efforts to protect one of the world’s richest biodiversity hotspots. Every newly described species helps scientists better understand evolution, ecosystem dynamics and the natural history of life on Earth.
