The Celebes macaque (Macaca nigra), also known as the crested black macaque, Sulawesi crested macaque, or the black ape, is an Old World monkey that lives in the Tangkoko reserve, northeast of the Indonesian island of Sulawesi (Celebes), as well as on smaller neighboring islands.
Locally known as yaki or wolai, its skin and hairless face is, with the exception of some white hair in the shoulder range, entirely jet black. Unusual for a primate, it has striking reddish-brown eyes. The long muzzle with high cheeks and the long hair tuft, or crest, at the top of the head are remarkable features.
It has an “apelike” appearance due to its almost non-existent, non-visible, vestigial tail stub of only approximately 2 cm (1 in). With a total body length of 44 cm (17 in) to 60 cm (24 in) and a weight of 3.6 kg (8 lb) to 10.4 kg (23 lb), it is one of the smaller macaque species.
Its life expectancy is estimated at approximately 20 years in the wild.
It lives typically in groups of five to twenty-five animals, and occasionally in groups of up to seventy-five animals. Smaller groups have only a single adult male, while larger groups have up to four adult males.
However, adult females always outnumber adult males by about 4:1. Young adult males are forced to leave their birth group upon maturity, sometimes forming bachelor groups before seeking a connection to an existing adult mixed gender group.
Communication consists of various sounds and gestures; such as the presentation of the long eyeteeth while grimacing, a clear threatening gesture.
The Celebes crested macaque is a diurnal rain forest dweller.
This macaque is primarily terrestrial, spending more than 60% of its day on the ground foraging for food and socializing, while sleeping and searching for food in the trees.
The Celebes crested macaque is frugivorous, with 70% of its diet consisting of fruits. It also consumes leaves, buds, seeds, fungus, birds and bird eggs, insects (such as caterpillars), and the occasional small lizard or frog.
WHERE DO THEY LIVE?