Crab-eating macaque

Description
It is a medium sized primate with a long tail. Its fur is brown, the lower section paler and the face dark grey. They are excellent swimmers, foraging in mangroves to catch crabs, frogs, shrimps and other invertebrates. They have cheek pouches, where they can store food to transport it away from the place of foraging. 

Ethology
They are very social diurnal animals, living in large groups, which can have over 100 individuals. Their groups are divided into subgroups, and it is very unusual to see macaques living alone. After 7-8 months of gestation, females give birth to a single young.

Interesting facts
The main threat to this species is hunting. In Southeast   Asia, females are kept in breeding facilities and males are exported, mainly for use in laboratory research. It is also hunted as a pest. It is included on the list of 100 most harmful invasive exotic species in the world due to its ease   in adapting to environments and eating anything, leading to the extinction of native species.