The crab-eating Macaque, Macaca fascicularis, is native to Southeast Asia, and is primarily arboreal. They weigh between 4 kg and 8 kg, varying from 17 to 25 inches in length.

Contrary to what their name may suggest, they do not eat only crabs. They eat anything from seeds, roots and leaves to invertebrates and birds’ eggs. Highly social by nature, they move about in groups headed by females, who remain in one place for a long time. The males, on the other hand, keep shifting groups every four to five years.

The females give birth to a single offspring after a 180-day gestation period. The young one is then taken care of by its mother till it can find food for itself and is ready to move to a new group. The groups have a very strong hierarchy, and the higher-ranked females may, at times, even kidnap the offspring of lower-ranked females.