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
Macaque and have become an invasive species in some human inhabited landscapes, such as the island of Mauritius and Silver Springs State Park in Florida. Macaques can be a threat to conservation, along with a threat to human wellbeing through carrying transmittable and fatal diseases. Currently, macaques as an invasive species are handled with several control methods. Aside from humans (genus "Homo"), the macaques are the most widespread primate genus, ranging from Japan to the Indian subcontinent, and in the case of the barbary macaque ("Macaca sylvanus"), to North Africa and Southern Europe. Twenty-three macaque species are currently recognized, all of