The Sulawesi macaque, Macaca nigra, is found on the large island of Sulawesi in Indonesia. The Sulawesi macaque is also found on other smaller islands close to Sulawesi, such as the island of Bacan. [Figure 1.1] shows a Sulawesi macaque. (a) The International Union for Conservation of Nature (IUCN) is the world's largest global environmental organisation. The IUCN Red List of Threatened Species™ evaluates the conservation status of plant and animal species. The Sulawesi macaque is categorised as critically endangered on the IUCN Red List. Table 1.1 shows the numbers of humans and the numbers of Sulawesi macaques on Sulawesi and Bacan. | island | area / km² | number of humans | number of humans per km² | number of macaques | number of macaques per km² | |:---------|:-----------|:-----------------|:-------------------------|:-------------------|:---------------------------| | Sulawesi | 174600 | 17360000 | 99.43 | 5200 | | | Bacan | 1900 | 60741 | 31.97 | 90000 | 47.37 |