Deep in Bolivia’s Yungas cloud forests, scientists have

uncovered something that had been hiding in plain sight for generations. It is tiny, spotted and, at first glance, easy to mistake for an ordinary kitten—but years of investigation have revealed that the animal belongs to a wild-cat lineage previously unknown to science.

The discovery of Leopardus tilcayo marks an extraordinary moment for feline research. The species was not newly encountered in 2026; researchers first became curious about an unusual cat years ago. What followed was a painstaking investigation involving physical comparisons, modern genomics and even DNA preserved in museum specimens.

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The Mystery of a Tiny Cat in Bolivia’s Yungas

Leopardus tilcayo, commonly known as the tilcayo tiger cat, belongs to the Leopardus genus, a group of small wild cats found across Central and South America.

The newly described cat is slender and covered in spots, with rounded ears and a relatively long tail. One known male measures approximately 18 inches from head to body and weighs around 3 pounds—making it smaller than the average domestic cat.

Its known habitat is Bolivia’s Yungas, a mountainous cloud-forest region on the eastern slopes of the Andes, where the Andes meet the Amazon basin.

But the scientific story did not begin with researchers finding an unknown animal in the forest.

It began when someone thought he had found a kitten.

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A “Kitten” That Wasn’t Quite What It Seemed

The unusual animal had already been living under human care when Paola Nogales-Ascarrunz, a Bolivian biologist, National Geographic Explorer and co-lead author of the research, became involved.

A local man had found the animal as a kitten near a forest and took it home, believing it was a domestic cat. He fed it ordinary household food, including noodles, rice and eggs.

Eventually, he realized the animal was wild and could not be kept as a pet. It was brought to the Senda Verde Wildlife Sanctuary in the Yungas region.

When Nogales-Ascarrunz saw the animal, its unusually small size immediately stood out.

“I saw this cat. It was really, really small, and I couldn’t believe how small it was. I thought it was a kitten.” — Paola Nogales-Ascarrunz

At first, researchers thought the animal might simply belong to a tiger cat species that was already known to science.

Then the details stopped adding up.

Nogales-Ascarrunz began comparing the cat’s physical characteristics with existing descriptions. Its markings and tail did not appear to match the species with which it had been classified.

“If you look at the spots or the tail, they really don’t match.” — Paola Nogales-Ascarrunz

That mismatch raised a much bigger question: was this simply an unusual example of a known species, or had researchers stumbled across something that science had never formally recognized?

The answer would eventually come from the animal’s DNA.

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Complete Genomes Expose a Hidden Wild Cat Lineage

Physical characteristics provided the first clues, but genetics supplied the decisive evidence.

Researchers analyzed complete genomes from 38 individuals belonging to the Leopardus genus. The samples came from different parts of South America and included both contemporary animals and historical museum specimens.

Eight of the genomes came from museum specimens, allowing researchers to examine genetic material preserved in historical collections alongside DNA from living animals. This approach, known as museomics, became an important part of the investigation.

The results changed the picture of the tiger cat group.

What scientists had historically treated as a single tiger cat complex was actually made up of five genetically distinct species.

The study identified:

Scientific name	Status in the study
Leopardus guttulus	Distinct tiger cat species
Leopardus emiliae	Distinct tiger cat species
Leopardus pardinoides	Distinct tiger cat species
Leopardus tigrinus	Distinct tiger cat species
Leopardus tilcayo	Newly described species

Researchers also identified a newly recognized subspecies in Peru’s Yungas: Leopardus tigrinus antisuyo.

The findings showed that the Bolivian animal was not simply an unusual individual belonging to one of the already recognized tiger cat species.

It represented its own evolutionary lineage.

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Leopardus tilcayo Split From Other Tiger Cats 1.4 Million Years Ago

The researchers estimate that Leopardus tilcayo diverged from other tiger cat lineages approximately 1.4 million years ago.

That deep evolutionary separation was significant in establishing the animal as a distinct species rather than merely a variation within another tiger cat population.

The discovery also highlights one of the trickiest parts of wildlife taxonomy: appearances can be deceptive.

Small wild cats can look remarkably similar, making it difficult to distinguish species based only on photographs or physical observations. Genetic analysis can uncover evolutionary differences that are invisible to the human eye.

Eizirik, one of the researchers involved in the study, described the broader finding as evidence of previously hidden diversity within the tiger cat group.

“What we once thought to be a single species, we’ve started to see that it was actually a species complex.” — Eizirik

The formal description was published on September 17 in Current Biology in a study titled “Phylogenomics and museomics reveal five distinct species of tiger cats in South America.”

So, after years of questions surrounding one remarkably small cat, the genetic evidence finally gave the animal its place on the scientific family tree.

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The Name “Tilcayo” Came From Local Communities

There is another remarkable part of the story.

Although Leopardus tilcayo is new to formal science, the animal itself was not unknown to people living in the Bolivian Yungas.

Local communities have reportedly referred to the cat as “tilcayo” for generations.

Researchers chose to preserve that traditional name rather than replace it with a newly invented scientific or common name.

Nogales-Ascarrunz explained that when researchers asked local residents why they called the animal tilcayo, they learned that the name had simply been passed down through generations.

“This cat, they call it tilcayo. And when you ask, ‘Does it have some meaning in Quechua or Almyra and other Indigenous languages?’ they say, ‘No, my grandpa told me that’s the tilcayo.’ This is a traditional knowledge that they have in the community. We want to preserve that knowledge and we didn’t want to give it another name.” — Paola Nogales-Ascarrunz

That makes the discovery an important distinction between scientific recognition and human awareness.

Scientists have only now formally described Leopardus tilcayo, but people living alongside the animal already knew it existed and had a name for it.

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Scientists Still Have Major Questions About the New Species

The genetic breakthrough has answered one major question while opening many more.

Scientists still do not have a reliable estimate of how many Leopardus tilcayo remain in the wild. Its complete geographic range is also unknown.

Nogales-Ascarrunz emphasized how much remains to be learned.

“We really don’t know how many cats are still in the wild. We need science, we need more studies to answer this question, which is actually critical for its conservation.” — Paola Nogales-Ascarrunz

Available evidence suggests the cat may be primarily nocturnal. Camera-trap observations and the remains of small rodents found in scat indicate that small mammals could form part of its diet.

But researchers still need much more information about the animal’s behavior, reproduction, population density, territory and interactions with other species.

As Nogales-Ascarrunz put it:

“So many basic things are not known.” — Paola Nogales-Ascarrunz

The research team is now working to install camera traps in the Yungas forest. The goal is to locate additional individuals and determine how widely the species is distributed.

Researchers also want to establish whether L. tilcayo occurs elsewhere in Bolivia or extends beyond the region where it is currently documented.

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Why the Discovery Matters for Conservation

The scientific importance of Leopardus tilcayo goes well beyond giving a tiny cat a new name.

The Yungas is an ecologically important but increasingly threatened environment. Forest loss, agriculture, mining and other human pressures are reducing and fragmenting habitat in parts of the region.

Small wild cats already face threats that include habitat destruction, hunting, wildlife trafficking and diseases transmitted by domestic animals.

The newly published research argues that resolving the tiger cat family tree is essential for conservation. Animals previously grouped together as one widespread species may actually represent several geographically restricted species, each potentially facing very different levels of vulnerability.

Tadeu de Oliveira, another co-author of the research, emphasized the pressure facing tiger cats:

“All of them are in habitats that are vanishing fast.” — Tadeu de Oliveira

The distinction could become particularly important when conservation agencies assess populations.

If several genetically distinct species have historically been grouped together, population numbers for what appeared to be a widespread species could make the overall situation look healthier than the circumstances of individual evolutionary lineages actually are.

Researchers have shared their findings with the International Union for Conservation of Nature as conservation assessments of the tiger cat lineages are reconsidered.

However, the exact conservation status of Leopardus tilcayo has not yet been established.

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Museum Specimens Helped Solve the Mystery

One of the most striking elements of the research is that the answer did not come exclusively from animals alive today.

Eight museum specimens contributed genomic information to the study.

Modern genetic technology can extract useful information from preserved material collected decades or even centuries ago. That can be especially valuable when researchers are studying animals that are difficult to locate in the wild.

By comparing historical specimens with living animals, the researchers were able to reconstruct relationships among tiger cat populations across South America and identify evolutionary divisions that had previously been obscured.

The work also helped resolve questions surrounding the original tiger cat specimens from the Guiana Shield, which played an important role in the historical classification of the group.

In other words, pieces of the puzzle were scattered across living populations and museum collections—and modern genomics helped bring them together.

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The First New Living Cat Species Described in More Than 100 Years

The discovery has attracted global attention because formally describing an entirely new living feline species is extraordinarily unusual.

National Geographic reported that the previous newly described living cat species was the pampas cat in 1923.

More than a century later, Leopardus tilcayo has now been formally described as a new living feline species.

That does not mean scientists have spent the intervening decades finding no differences among cats. Scientific research has revised the classification of existing feline populations, but this case represents a new living cat species being formally named and described after more than 100 years.

And the evidence behind it is substantial.

Researchers did not simply see an unusually small spotted cat and declare it a new species. They combined extensive genomic evidence with physical characteristics, geographic information and historical museum specimens to establish the animal as a distinct evolutionary lineage.

The result is more significant than a new entry on a list of felids.

It shows that an entire group of South American wild cats contains considerably more evolutionary diversity than scientists previously recognized.

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What Comes Next for Leopardus tilcayo?

For Nogales-Ascarrunz, formal recognition is only the beginning.

Scientists now need to establish how many tilcayo cats remain, where they live and what threats they face.

“It’s a new reason to protect the world.” — Paola Nogales-Ascarrunz

The research team hopes continued fieldwork in the Yungas will locate additional tilcayo cats and clarify their distribution.

For now, Leopardus tilcayo remains one of the least understood members of South America’s wild-cat family.

That makes its story unusually uplifting and scientifically fascinating. A cat that was once mistaken for a domestic kitten has now been revealed, through years of investigation and modern genetic research, as part of an evolutionary lineage that had remained hidden from formal science.

Conclusion

The discovery of Leopardus tilcayo is a reminder that the natural world can still surprise scientists in extraordinary ways. A tiny wild cat from Bolivia’s Yungas has become the first newly described living feline species in more than a century, while genomic research has revealed that South America’s tiger cat group contains five distinct species rather than the single complex scientists once recognized.

Yet the discovery also comes with unanswered questions. Researchers still do not know the tilcayo’s population size, complete range or exact conservation status.

The next chapter will depend on fieldwork, camera traps and continued research. For now, the species has a formal scientific identity—and a name preserved from the communities that have known the animal for generations.

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Disclaimer: This article has been prepared based on thorough research of the sources provided with the original material, including the Current Biology study, National Geographic, PUCRS, the University of Antioquia, Reuters and NBC News. It reflects the information available from those sources and the verified material provided for this article. The population size, complete range and conservation status of Leopardus tilcayo remain uncertain and are subject to further scientific research.

Sources

• Current Biology — “Phylogenomics and museomics reveal five distinct species of tiger cats in South America”
• National Geographic — “Meet the First New Cat Species Discovered in 100 years”
• Pontifical Catholic University of Rio Grande do Sul (PUCRS) — New *Leopardus tilcayo* research
• University of Antioquia — Five tiger-cat species identified in South America
• Reuters — “New cat species identified in Bolivia, first in over a century”
• NBC News — “New wild cat species is identified for first time in 100 years”

Featured Image Credit:

• Jesús Alzamora on Pexels