Crested black macaque  (Macaca nigra)

Endemic: A species or taxonomic group that is only found in one particular country or geographic area.
Gestation: The state of being pregnant; the period from conception to birth.
Oestrous: The time of ovulation (release of an egg from the ovary) in female mammals when the female becomes receptive to males, also known as ‘heat'.
Primary: Primary rainforest is rainforest that has remained undisturbed for a long time and has reached a mature condition.
Secondary: Secondary rainforest is rainforest that has re-grown after a major disturbance, such as fire or timber harvest, but has not yet reached the mature state of primary forest.

1. IUCN Red List (October, 2008)
   http://www.iucnredlist.org
   
2. Richardson, M. (2005) Pers. Comm.
   
3. CITES (January, 2004)
   http://www.cites.org
   
4. Macdonald, D. (2001) The New Encyclopedia of Mammals. Oxford University Press, Oxford.
   
5. Durrell Wildlife Conservation Trust (January, 2004)
   http://www.durrell.org/Animals/Mammals/Sulawesi-crested-black-macaque
   
6. Nowak, R.M. (1999) Walker's Mammals of the World. The John Hopkins University Press, Baltimore and London.