Celebes Crested Macaque

Locally known as yaki, wolai, or bolai, its skin and hairless face is, with the exception of some white hair in the shoulder range, entirely jet black. It has a long muzzle with high cheeks, a long hair tuft, or crest, at the top of the head and striking reddish-brown eyes, unusual for a primate. Uniquely among macaques, males and young females bear a heart-shaped skin pad on the rump.Although possessing a markedly ape-like appearance, it has an almost non-existent, non-visible, vestigial tail stub of only approximately 2 cm (0.8 in). Females grow up to 44 to 55 cm (17 to 22 in), and up to 5.5 lb (2.5 kg), while males grow up to 52 to 57 cm (20 to 22 in), and up to 9.5 to 12.7 kg (21 to 28 lb), it is one of the smaller macaque species. Its life expectancy is estimated at 18 years in the wild, and 34 was the maximum in captivity.

Macaca nigra has around eight subpopulations, with a introduced population on the island of Bacan. M. nigra seems to prefer closed canopy forests, with the occupancy being higher along with protected areas.

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 socialising, 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, mushrooms, small birds and bird eggs, insects (such as beetles and caterpillars) worms, snails, spiders and the occasional small lizard or frog.