Clouded leopards are actually one of the most ancient cat species, however due to their inability to roar or purr, they cannot officially be considered a big cat (roar) or a small cat (purr) due to their definition, which puts them in an odd category. They are most closely related to snow leopards, and are in the same family as the big cats from genetic research. It has recently been confirmed that there are 2 different clouded leopard species, one on the mainland, and the other on the islands (the sunda clouded leopard.

Both species are considered vulnerable. The mainland clouded leopard is thought to number between 3700 and 5580, while the sunda clouded leopard is thought to number around 4500 3800 in Borneo and 730 on Sumatra.