Kinabatangan is a prime location for primate sightings, with the Long-tailed Macaque, Pig-tailed Macaque, Proboscis Monkey, and Silvered Langur being the most commonly seen throughout the year. 

Orangutans and Maroon Langurs are more elusive, often requiring keen observation and some luck.  

The rarest primates include the Bornean Gibbon, Slow Loris, and Western Tarsier. The Bornean Gibbon's preference for dense forests, along with the nocturnal habits of the Slow Loris and Western Tarsier, make sightings exceptionally rare in the area.

Do note that some primates in Kinabatangan are harder to sight than others due to various factors, including their habitat preferences, behaviors, and population densities. Overall, Kinabatangan offers a diverse primate-watching experience, each species presenting unique challenges and rewards. 

MAMMALS OF KINABATANGAN CLASSIFIED BY THEIR THREATENED STATUS

Critically Endangered
- Bornean Pygmy Elephant (Elephas maximus borneensis)
Endangered
- Sun Bear (Helarctos malayanus)
Vulnerable
- Bearded Pig (Sus barbatus)
Near Threatened
- Leopard Cat (Prionailurus bengalensis)
Least Concern
- Plantain Squirrel (Callosciurus notatus)
- Prevost's Squirrel (Callosciurus prevostii)
- Common Palm Civet (Paradoxurus hermaphroditus)
Data Deficient
- Lesser Mouse-Deer (Tragulus kanchil)
- Sea Otter (Enhydra lutris)

NOTE: These classifications are based on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species.

In Kinabatangan, the most commonly sighted reptiles are the Water Monitor Lizard and the Saltwater (or Estuarine) Crocodile, known for their impressive size and adaptability. 

Less commonly seen are the Draco Gliding Lizard, capable of gliding between trees, and the vibrantly colored Paradise Tree Snake. 

Rare sightings include the Green Tree Lizard, Yellow-Ringed Cat Snake, Python, and King Cobra. 

Amphibians such as tree frogs and various species of toads are also present, contributing to the rich biodiversity. These reptiles and amphibians play crucial roles in the ecosystem, adding to Kinabatangan’s allure for wildlife enthusiasts.

REPTILES OF KINABATANGAN CLASSIFIED BY THEIR THREATENED STATUS

Critically Endangered
- None listed
Endangered
- None listed
Vulnerable
- Saltwater (Estuarine) Crocodile (Crocodylus porosus)
- King Cobra (Ophiophagus hannah)
Near Threatened
- None listed
Least Concern
- Water Monitor Lizard (Varanus salvator)
- Draco Gliding Lizard (Draco spp.)
- Paradise Tree Snake (Chrysopelea paradisi)
- Green Tree Lizard (Bronchocela cristatella)
Data Deficient
- Yellow-Ringed Cat Snake (Boiga dendrophila)
- Python (Python reticulatus)

AMBHIBIANS OF KINABATANGAN CLASSIFIED BY THEIR THREATENED STATUS

(NOTE: Specific IUCN statuses for amphibians in Kinabatangan might not be listed here due to lack of detailed data, but general statuses are provided where possible.)

Least Concern
Various tree frogs (Family: Rhacophoridae)
Common toads (Family: Bufonidae)
Data Deficient
Specific amphibian species with insufficient data

NOTE: These classifications are based on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species where available.