Borneo’s rainforests come alive at night with a fascinating array of nocturnal mammals, many of which are rarely seen during the day. These include secretive predators like the Sunda clouded leopard and the flat-headed cat, as well as smaller carnivores such as civets, leopard cats, and the endemic Bornean ferret-badger. Arboreal species are especially active after dark, including flying squirrels, colugos (also known as flying lemurs), and slow lorises, which move silently through the canopy in search of fruit, insects, or small prey. Nocturnal primates like the western tarsier, with their enormous eyes and incredible leaping ability, add to the rainforest’s night-time magic. Exploring Borneo’s forests after sunset reveals an entirely different world, filled with sound, movement, and mystery.