The crab-eating macaque is widely distributed throughout Southeast Asia and adapts to a variety of habitats such as mangroves and swamp forests. Body length is 40–50 cm; males weigh about 5–7 kg and females about 3–4 kg; they have a long tail (50–60 cm). They are primarily frugivorous but omnivorous, also eating leaves, shellfish, fish, and insects. Groups are multimale–multifemale, forming matrilineal societies of about 30 individuals; dominance hierarchy affects breeding opportunities and access to resources. Reproduction is seasonal; gestation is about 160 days, producing a single offspring. Conservation status is Near Threatened, but populations are in decline. Scientific name: Macaca fascicularis.