Kinabatangan Wildlife Sanctuary is one of two known places in the world to be inhabited by ten species of primates four of which are endemic to Borneo. It is also one of two places in the world where four colobines inhabit the same place – namely proboscis monkey, silvered langur, maroon langur and Hose’s or grey langur. It has the highest concentration of proboscis monkeys and orang utans in Malaysia.

Other wildlifes include long-tailed macaque, pig-tailed macaque, Bornean gibbon, two nocturnal primates namely western tarsier and slow loris and other mammals including Asian elephant and Sumatran rhinoceros.

Hoofed mammals which are mainly active at night include wild cattle or Tembadau, bearded pig and four species of deer namely sambar, greater mouse-deer, barking deer and lesser mouse-deer which is also the world’s smallest hoofed mammal.

Carnivores include the Malayan sun bear, the world’s smallest bear, four species of wild cat namely clouded leopard, which is the largest wild cat in Borneo, the leopard cat, marbled cat and flat-headed cat. Other small mammals include hairy-nosed otter, oriental small-clawed otter, smooth otter, Malay civet, common palm, small toothed palm, banded palm and moon rat.

Reptiles include reticulated python, tortoise, freshwater terrapin, monitor lizard and crocodile.