Forests may look calm from afar, but the cacophony of the sounds of nature tells a different story.

The Central Catchment Nature Reserve is a treasure trove of wildlife. Here are some of the rare mammals that can be found in Singapore's largest nature reserve:

HORSFIELD'S FLYING SQUIRREL

This is the most commonly seen flying squirrel in Singapore. It has a large, thin, reddish-brown flap called the patagium which connects the forelimbs and hindlimbs, and allows it to glide from tree to tree. In Singapore, it is one of three nationally threatened flying squirrel species. The others are the red-cheeked flying squirrel and the red giant flying squirrel.

SUNDA PANGOLIN

The Sunda pangolin is critically endangered globally as it is poached for its meat and scales.

LESSER MOUSEDEER

Critically endangered here, the lesser mousedeer inhabits primary and mature secondary rainforests. It is the smallest hoofed animal in Singapore.

SUNDA SLOW LORIS

Critically endangered in Singapore, this nocturnal creature is usually slow, but can move quickly when catching prey.

SOURCES: MARCUS CHUA, LEE KONG CHIAN NATURAL HISTORY MUSEUM, INTERNATIONAL UNION FOR CONSERVATION OF NATURE , INFOPEDIA