Crab-eating Macaque

Macaca fascicularis, commonly called the crab-eating macaque, long-tailed macaque or cynomolgus monkey, is native to Southeast Asia and thrives near human settlements and in secondary forest as a synanthropic species. It lives in matrilineal groups of ten to eighty-five individuals, with females remaining in their birth group and males leaving at puberty, and it is the only Old World monkey known to use stone tools while foraging. The most heavily traded primate species and the most widely used in scientific research, it was listed as endangered on the IUCN Red List in 2022 because of those same pressures.