As the sanctuary is situated in very isolated area the wildlife of the sanctuary is comparatively better than most other national parks of Bangladesh.
However, for the same reason its very unprotected.
And hunting, poaching, illegal deforestation has become a common scene in the sanctuary due to the lack of management from forest department.
Also the fauna data isn't well documented.

Other than Sangu river there are some gorgeous looking small waterfalls all around the forest reserve.
Some of the fish and amphibians found in the Sangu river are sawfish , butter fish , electric ray, common carp, silver carp, barb, river eels, starfish, king crab , fiddler crab, hermit crab, prawn etc.

The wide variety of plant life provides suitable habitats for 55 species of mammals including the capped leaf monkey and binturong, 286 species of birds like the hill myna, house swift and the greater painted-snipe; 56 species of reptiles and 13 species of amphibians.
A limited number of Asian elephants live in the park.
Common animals including reptiles and mammals are rhesus macaque , barking deer, Asian black bear, monitor lizard, Bengal monitor, etc.
Golden jackals, fishing cats and dholes are common predators of the forest.
There's few elusive clouded leopards too roaming inside the remoteness.

Indian leopard is very rare.
However big cat pug marks supposed to be of leopard are occasionally found.
Also there's one camera trapped pic of a leopard close to sangu wildlife sanctuary caught in 2015 proving its existence.

The wildlife sanctuary was once covered with luxuriant multi-storied evergreen forest.
The Asian elephant herds used to roam in and around the sanctuary.
However, due to settlement of refuge, the vegetation of these areas diminished and became uninhabitable for elephants, which now can be seen in Sangu Mouza only.
 Asian black bear is the most common bear species in the area but still low numbered.
Second bear species of the area is Sun bear  Other large mammal sambar deer are also been reported here but in lower numbers.
Just recent camera trap project captured some clouded leopard photos.
Endangered species great hornbill are still seen flying in the sanctuary.
There are some spotted owlet as well.

There are reports of tigers in the mixed evergreen hill tract valleys of Sangu-Matamuhuri, which are contiguous with forests in India and Myanmar respectively.
Both of these sites are within an area classified as a Tiger Restoration Landscape, contiguous with the Northern Forest Complex-Namdapha-Royal Manas Global Priority Tiger Conservation Landscape (TCL).
As the sanctuary is situated in very isolated area the wildlife of the sanctuary is comparatively better than most other national parks of Bangladesh. However, for the same reason its very unprotected. And hunting, poaching, illegal deforestation has become a common scene in the sanctuary due to the lack of management from forest department. Also the fauna data isn't well documented.
Other than Sangu river there are some gorgeous looking small waterfalls all around the forest reserve. Some of the fish and amphibians found in the Sangu river are sawfish , butter fish , electric ray, common carp, silver carp, barb, river eels, starfish, king crab , fiddler crab, hermit crab, prawn etc.
The wide variety of plant life provides suitable habitats for 55 species of mammals including the capped leaf monkey and binturong, 286 species of birds like the hill myna, house swift and the greater painted-snipe; 56 species of reptiles and 13 species of amphibians. A limited number of Asian elephants live in the park. Common animals including reptiles and mammals are rhesus macaque , barking deer, Asian black bear, monitor lizard, Bengal monitor, etc. Golden jackals, fishing cats and dholes are common predators of the forest. There's few elusive clouded leopards too roaming inside the remoteness.
Indian leopard is very rare. However big cat pug marks supposed to be of leopard are occasionally found. Also there's one camera trapped pic of a leopard close to sangu wildlife sanctuary caught in 2015 proving its existence.
The wildlife sanctuary was once covered with luxuriant multi-storied evergreen forest. The Asian elephant herds used to roam in and around the sanctuary. However, due to settlement of refuge, the vegetation of these areas diminished and became uninhabitable for elephants, which now can be seen in Sangu Mouza only.  Asian black bear is the most common bear species in the area but still low numbered. Second bear species of the area is Sun bear  Other large mammal sambar deer are also been reported here but in lower numbers. Just recent camera trap project captured some clouded leopard photos. Endangered species great hornbill are still seen flying in the sanctuary. There are some spotted owlet as well.
There are reports of tigers in the mixed evergreen hill tract valleys of Sangu-Matamuhuri, which are contiguous with forests in India and Myanmar respectively. Both of these sites are within an area classified as a Tiger Restoration Landscape, contiguous with the Northern Forest Complex-Namdapha-Royal Manas Global Priority Tiger Conservation Landscape (TCL).
Sangu Matamuhari