The Bornean clouded leopard (Neofelis diardi borneensis) is a subspecies of the Sunda clouded leopard. It differs from the Batu-Sumatran clouded leopard in the shape and frequency of spots, as well as in cranio-mandibular and dental characters.
In general Bornean clouded leopards look similar to Sunda clouded leopards. They are overall grayish yellow or gray hue and have a double midline on the back marked with small irregular cloud-like patterns on the shoulders. Their pupils contract to vertical slits and the tail can grow to be as long as their body, aiding balance.
Bornean clouded leopards are native to the island of Borneo. In Kalimantan, these animals live in Sabangau National Park. In northern Sarawak, they inhabit mixed dipterocarp forests outside a protected area. In Sabah, clouded leopards were recorded in Danum Valley Conservation Area, Ulu Segama, Malua, and Kabili-Sepilok Forest Reserves, Tabin Wildlife Reserve, and the Lower Kinabatangan Wildlife Sanctuary.
Information about the habits of these animals is scarce because of their secretive nature. It is assumed that they are generally solitary. They are active during the night and hunt mainly on the ground; however, to escape the danger they readily use their climbing skills and prefer to hide in trees.
Bornean clouded leopards are carnivores and prey on a wide variety of terrestrial and arboreal mammals and birds.
Little is known about the reproductive behavior of Bornean clouded leopards. In general, Sunda clouded leopards are thought to breed year-round. Females give birth to a litter of 1-5 cubs after the gestation period that lasts about 85-95 days. The young are born helpless; their eyes are closed and they have no teeth. The cubs are usually weaned and become independent from their mothers at the age of 10 months and become reproductively mature when they are 2 years old.
Bornean cloud leopards are threatened by anthropogenic disturbances such as deforestation, illegal poaching, and hunting pressure.
According to IUCN Red List, the total population size of the Bornean clouded leopards is around 3,800 mature individuals. Currently, this species is classified as Endangered (EN) on the IUCN Red List, and its numbers today are decreasing.
