Native to Southeast Asia, this species was probably introduced by the Dutch settlers during the seventeenth century or by the Portuguese in the sixteenthcentury. These macaques are social animals, living in groups of thirty to fifty individuals, or even more. They are grey–brown in colour, and often appear to have ‘whiskers’ on their face.
Crab-eating macaques are very adaptable, partly because they have such a varied diet, feeding on leaves, fruits, lizards, insects, birds’ eggs and fledglings and on sugar cane and vegetable crops. The macaque is under threat from hunting for food and habitat loss due to logging. This notorious pest has made it onto the World Conservation Union's list of 100 of the World's Worst Invasive Alien Species, for its negative impact on the biodiversity of the countries to which it has been introduced.