Crab-eating macaque 27% animal matter, 15% flowers and other plant matter, and 14% food provided by humans. This species exhibits particularly low tolerance for swallowing seeds. Despite their inability to digest seeds, many primates of similar size swallow large seeds, up to , and simply defecate them whole. The crab-eating macaque, though, spits seeds out if they are larger than . This decision to spit seeds is thought to be adaptive; it avoids filling the monkey’s stomach with wasteful bulky seeds that cannot be used for energy. It also can help the plants by distributing seeds to new areas: Crab-eating macaques eat
Nicobar long-tailed macaque territory measures some on average. The Nicobar long-tailed macaque is a frugivore, with its principal diet consisting of fruits and nuts. In common with other crab-eating macaques it turns to other sources of food—typically in the dry and early rainy tropical seasons—when the preferred fruits are unavailable. This alternate diet includes young leaves, insects, flowers, seeds, and bark; it is also known to eat small crabs, frogs and other creatures taken from the shorelines and mangroves when foraging in these environments. Macaque populations which live in areas close to human settlements and farms frequently raid the croplands for food, and