The celebes apes is listed under Appendix II by CITES (Wilson, 1993). The habitat of the celebes ape is constantly shrinking on this island due to an increase of human activity, which includes cultivation, logging, and catching and killing celebes apes. On the other islands where celebes apes are found, mainly Bacan, the amount of human activity has not affected the population in any significant way (Hamaca, 1994).