The Dusky leaf monkey or a spectacled langur (Trachypithecus obscurus) is one of Langkawi resident primates. This monkey has a dark grey fur, large circles ring on each eyes that giving the appearance like eyeglasses with a fur crowning its head, white surrounding its mouth and creamy white colouring on its stomach.
The newborn baby langur colour is a bright orange or yellow. It takes about 6 months for the baby to start turning their fur into dark grey just same like an adult Langur. The Langur babies were in a bright colour because most predator are colour-blinded and would in fact not be able to tell the difference between orange and green. The colour design to make their mother to see their babies clearly.
They are diurnal and arboreal, mostly active during the day and spending most of their time high up in trees.