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New, never-before-seen images provide a glimpse into the secretive lives of a clouded leopard species found in the dense rainforests of Borneo and Sumatra

The Sunda clouded leopard stalks the dense rainforests of Borneo and Sumatra in search of bearded pigs and mouse deer to prey on. Its tawny coat, accented by dark, cloud-shaped spots, blends into its surroundings. Beyond such basics, however, much remains unknown about these elusive big cats, sometimes called “ghosts of the forest,” including how long they live and how they spend their time.

But a new set of images and data, captured between 2007 and 2023 in three reserves in the state of Sabah in Malaysian Borneo, reveal a never-before-seen glimpse into their secretive lives.

A recent study in Biotropica analyzing the 15 years of photos and other data observed 52 adult individuals, including 30 males and 22 females, helping to answer some of the questions about the species.

What really surprised the researchers was “how difficult it is to get females in front of the lens,” says the study’s lead author Katharina Kasper, a biologist with the Polish Academy of Sciences and the Leibniz Institute for Zoo and Wildlife Research.

That’s because females, it turns out, spend much of their time in the trees—much more time than males do. “Their physique hints at this, as their bodies are usually more slender and they have fluffier tails that help them balance,” Kasper says of the females. “Resident males, by contrast, spend much time circling and re-marking their territories [with urine], hence we capture them more often.”

The study, which was conducted by Kasper, as well as researchers from the global wild cat conservation organization Panthera and the Sabah Forestry Department, observed a single female over many years and determined that these cats may live up to 8.5 years in the wild—a new record for the species. (Although there are not enough members of this species in zoos to have solid numbers, a close relative, the mainland clouded leopard, lived to 20 years of age in a zoo, which aligns with the general trend of captive cats living about twice as long as wild ones.)

Kasper says the study has already helped the group tweak its research efforts to look at what factors influence the disturbance and survival of Sunda clouded leopards. In turn, this will help guide conservation efforts for this species, which is classified as vulnerable by the International Union for Conservation of Nature—one step up from endangered.

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A clouded leopard species

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