Celebes crested macaque are nursed for approximately one year, becoming fully mature in three to four years, females somewhat sooner than males. Because it devastates crops and fields, the Celebes crested macaque is hunted as a pest. It is also hunted to provide bushmeat. Clearing the rain forests further threatens its survival. Its situation on the small neighbouring islands of Sulawesi (such as Bacan) is somewhat better, since these have a low human population. The total population of the macaque on Sulawesi is estimated at 4,000–6,000, while a booming population of up to 100,000 monkeys is found on Bacan. A series of survey
Lion-tailed macaque other macaques, it avoids humans. In group behavior, it is much like other macaques; it lives in hierarchical groups of usually 10 to 20 animals, which consist of few males and many females. It is a territorial animal, defending its area first with loud cries towards the invading troops. If this proves to be fruitless, it brawls aggressively. Lion-tailed macaque behaviour is characterized by typical patterns such as arboreal living, selectively feeding on a large variety of fruit trees, large interindividual spaces while foraging, and time budgets with high proportion of time devoted to exploration and feeding. It primarily eats