The clouded leopard (Neofelis nebulosa) sits in a fascinating middle ground in the cat family. It is larger than many small cats like the ocelot, but not part of the true big cat group that includes lions, tigers, and leopards. Scientists place it in its own genus, Neofelis.

Size-wise, adults typically weigh between 11 and 23 kilograms (24 to 51 pounds), roughly the size of a large dog, and their body length runs between 60 and 110 centimeters (24 to 43 inches), not counting the tail.

The name comes from the markings. Clouded leopards have large, irregular patches on their fur that resemble clouds, with dark edges and slightly paler centers. The background color ranges from pale yellow to rich tawny brown, and those cloud-shaped markings are outlined in black. No two cats have identical markings, much like human fingerprints.

In a forest, broken light and shadow make those markings almost impossible to track with the eye.

These cats are extraordinary climbers. Their legs are short and sturdy relative to their body, which lowers their center of gravity and gives them stability on branches. Their large paws have sharp, curved claws that grip bark with remarkable precision. Their ankle joints are unusually flexible, rotating in ways that most cats cannot manage, which is what allows them to descend tree trunks headfirst the same way a squirrel does. Most cats, including domestic ones, have to awkwardly back down or jump.

Their tail is another standout feature, often matching the entire length of the body, and it acts as a counterbalance while the cat moves through the canopy.

Clouded leopards have canine teeth that are among the longest relative to body size of any living cat. Proportionally, their canines resemble those of the long-extinct saber-toothed cats. These teeth can reach up to 4 centimeters (about 1.6 inches).

Their exact hunting technique is not fully understood, but researchers believe they likely deliver a quick, precise killing bite to the back of the neck or base of the skull, a method that requires both accuracy and serious jaw strength.

Clouded leopards are carnivores and ambush hunters. Rather than chasing prey over long distances, they rely on stealth and surprise, stalking quietly through the trees and along the forest floor before striking.

Their menu includes deer, wild pigs, monkeys, birds, and smaller mammals. There is also evidence they hunt from the trees, dropping onto prey from above, though this behavior is difficult to observe directly since these cats are notoriously secretive and rarely spotted in the wild.

Clouded leopards are solitary and mostly nocturnal, meaning they are most active after dark. They are so elusive that much of what we know about their behavior comes from camera trap footage and studies of captive animals rather than direct observation in the wild.

They do not roar like lions or tigers, because the anatomy of their throat works differently. Instead they produce a range of sounds including growls, hisses, prusten (a soft puffing sound used as a friendly greeting, also seen in tigers), and a low, moaning howl.

Clouded leopards are found across a broad stretch of South and Southeast Asia, ranging from the foothills of the Himalayas in Nepal and India through southern China, and down through Thailand, Malaysia, and Indonesia. They prefer dense, humid forests, particularly lowland tropical rainforests, though they also live in drier forests and at higher elevations.

Their close relative, the Sunda clouded leopard, is found specifically on the islands of Borneo and Sumatra and was only recognized as a distinct species in 2006, after genetic analysis revealed it had diverged enough to stand on its own.