There are around 5500 mammal species in the world, with at least 1000 species occurring in Southeast Asia.  Many of the region's mammal species are forest-dependant, which makes them difficult to study, particularly bats which are especially diverse.  Larger mammals such as Tiger, Asian Elephant and Orang Utan are well known to the general public, but the region also has some very curious species little known even in the countries they inhabit. These include the insect-eating Pangolin, covered in reptilian-like scales, and the Colugo which can glide from tree to tree by extending its broad gliding membrane.

The region also supports a complex diversity of smaller mammals including civets, tarsiers, squirrels, forest rats and treeshrews, some of which are illustrated here.  Bats are presented separately.
 

Order : Primates
Long-tailed Macaque		Pig-tailed Macaque		Proboscis Monkey		White-thighed Surili		Thomas's Leaf Monkey
Silvered Leaf Monkey		Spectacled Leaf Monkey		White-handed Gibbon		Orang Utan		Slow Loris
Spectral Tarsier
Order : Pholidota		Order : Proboscidea
Sunda Pangolin		Asian Elephant
Order : Artiodactyla
Wild Pig		Lesser Mousedeer		Sambar
Order : Carnivora				Order : Dermoptera
Smooth Otter		Common Palm Civet		Colugo or Flying Lemur
Order : Rodentia
Pencil-tailed Tree Mouse		Annandale's Rat		Polynesian Rat		Asian House Rat		Malaysian Wood Rat
Shrew-faced Ground Squirrel		Black Giant Squirrel		Large Black Flying Squirrel		Grey-bellied Squirrel		Mountain Red-bellied Squirrel
Variable Squirrel		Black-banded Squirrel		Plantain Squirrel		Horse-tailed Squirrel		Low's Squirrel
Slender Squirrel		Himalayan Striped Squirrel
Order : Insectivora		Order : Scandentia
House Shrew		Common Tree Shrew
Order : Cetacea
Humpback Whale		Long-snouted Spinner Dolphin