Researchers have announced the identification of a previously unknown feline prowling the mist‑shrouded Yungas forest of Bolivia. The diminutive predator, known locally as tilcayo, measures roughly 46 centimetres in length and weighs just 1.4 kilograms, making it smaller than the average house cat. Its formal scientific name, Leopardus tilcayo, retains the indigenous term that has long been used by communities living near the cloud‑forest canopy.
Discovery in the Cloud Forests of Bolivia
On 1 September 2026, Paola Nogales‑Ascarrunz, a National Geographic explorer, observed the animal at the Senda Verde animal refuge in the Yungas region. She noted that its coat is “light brown … with irregularly shaped rosettes across its body.” The sighting sparked curiosity because the cat’s markings did not align with descriptions of tiger cats drawn from Brazilian specimens. “This made us wonder: what tiger cat do we actually have in Bolivia?” she remarked, prompting a deeper investigation into the population’s identity.
Genetic Evidence Unveils a Hidden Lineage
To resolve the question, the research team collected DNA from 38 individuals spanning several South American countries, including eight museum specimens. Genetic analysis revealed that the Bolivian animal represents a distinct lineage, diverging from its relatives approximately 1.4 million years ago. Jonas Lescroart, evolutionary biologist at the University of Antwerp and co‑lead author of the study, said, “We never expected this Bolivian tiger cat to be a separate species, and no one had ever proposed it as a different animal, subspecies or otherwise.” The findings, published in Current Biology, classify the creature as Leopardus tilcayo and indicate that tiger cats comprise five genetically separate species rather than the two previously recognised.
Conservation Implications for the Yungas
Little is known about the tilcayo’s ecology, though rodent remains in scat suggest it preys on small mammals, and camera‑trap data point to nocturnal activity. The Yungas forest, a biodiversity hotspot, faces mounting threats from deforestation, agricultural expansion, human‑caused fires and mining. Nogales‑Ascarrunz stressed that “restoring forest patches damaged by fires, protecting remaining native forest and maintaining connections between habitats are urgent priorities.”
The International Union for Conservation of Nature currently lists tiger cats as two “vulnerable” species with declining populations. By presenting the five lineages separately, the upcoming IUCN review could refine risk assessments; the tilcayo may qualify as endangered when evaluated in isolation. Eduardo Eizirik, senior author from the Pontifical Catholic University of Rio Grande do Sul, warned that “showing the general public that even in a flagship group such as cats … there are still new species to be discovered may transmit an important message,” adding that countless undiscovered organisms remain at risk of vanishing before they are documented.
Why it Matters
The formal description of Leopardus tilcayo underscores how much biological diversity still hides in plain sight, even within well‑studied groups like felids. Recognising this new species not only enriches our understanding of South America’s evolutionary tapestry but also highlights the pressing need to safeguard the fragile Yungas ecosystem, where habitat loss could erase such unique lineages before their full ecological role is grasped.
