The crab-eating macaque (Macaca fascicularis) is a cercopithecine primate native to Southeast Asia. It is also called the “long-tailed macaque”, and is referred to as the “cynomolgus monkey” in laboratories.
The scientific name of the crab-eating macaque is Macaca fascicularis. Macaca comes from the Portuguese word macaco, which was picked up from makaku, a Fiot (West African language) word (kaku means ‘monkey’ in Fiot). Fascicularis is Latin for ‘a small band or stripe’. Sir Thomas Raffles, who gave the animal its scientific name in 1821, did not specify what he meant by the use of this word, although it is presumed it had something to do with his observation of the animal’s colour.