Stump-tailed macaques (Macaca arctoides) are a vulnerable species of macaques found in South and Southeast Asia. These monkeys are known for their interesting color patterns. The infants of this species are born with white fur which gradually darkens with age. Older individuals are identified by their dark-colored faces with black or brown patches.
Fact and sketch contributed by Bidisha Chakraborty
Source: Rowe N. 1996. The pictorial guide to the living primates. East Hampton (NY): Pogonias Pr. 263 p.