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
Macaque macaques have become invasive species in different parts of the world, while others that survive in forest habitats remain threatened. The long-tailed macaque ("Macaca fascicularis") is listed as a threat and invasive alien species in Mauritius along with the rhesus macaques ("Macaca mulatta") in Florida. The long-tailed macaque causes severe damage to parts of its range where it has been introduced because the populations grow unchecked due to a lack of predators. On the island Mauritius, they have created serious conservation concerns for other endemic species. They consume seeds of native plants and aid in the spread of exotic weeds