In 2009, Sulawesi’s black crested macaques or yaki (Macaca nigra) is returning into IUCN Red List of Endangered Species. The species is now probably one of the most endangered mammal species in Indonesia. Part of the problem is an accident of geography and religion. These large primates are eaten at celebratory dinners by the local people. However, in Tangkoko wildlife reserve of North Sulawesi, scientists found that the population of the monkeys is increasing.