This primate of Indonesia is the only ape whose name begins with an "O"
... As it is also the largest gibbon, it fits well with the general 
primate dietary... [DOC] [TLE] Primate Factsheets: Crested black macaque (Macaca nigra ... [PAR] Other names: black ape, Celebes crested macaque, Celebes ape, Celebes 
macaque, ... while defending food resources (Hadidian 1980; Kinnaird & O'Brien 
2000).