Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Behavior, Diet, and Movements of the Sulawesi Crested Black Macaque (Macaca nigra), Timothy G. O'Brien and Margaret F. Kinnaird, International Journal of Primatology, Vol. 18, No. 3, 1997 pp. 321-351