Sunda Colugo: The Gliding Phantom of Southeast Asia

In the dim green twilight of Southeast Asian forests, a strange mammal detaches from a tree trunk, spreads a vast skin membrane from neck to tail, and sails silently through the canopy. It does not flap its limbs or beat wings. It does not belong to the squirrel family, despite its gliding lifestyle, and it is not a lemur, despite its common nickname. This is the Sunda colugo, one of nature’s most extraordinary gliding mammals and a living reminder of how evolution can turn a forest floor escape route into a canopy highway.

Also known as the Malayan flying lemur or Malayan colugo, the Sunda colugo (Galeopterus variegatus) is a nocturnal, tree-dwelling mammal found across parts of mainland and island Southeast Asia. With enormous eyes, mottled bark-like fur, razor-sharp claws, and a dramatic gliding membrane called a patagium, it looks almost mythical when seen for the first time. Yet this “flying phantom” is very real—and scientifically fascinating.

The Sunda colugo is more than a curiosity. It is a specialized rainforest mammal, an important piece of Southeast Asia’s canopy ecosystem, and one of the closest living relatives of primates. Understanding this elusive animal helps us appreciate the complexity of tropical forests and the urgent need to protect them.