Nederlands: Negatief. Een grijze gibbon (hylobates cinereus mulleri), Borneo
Date circa 1930
Source Tropenmuseum
Author Unknown
Source: https://commons.wikimedia.org/wiki/File:COLLECTIE_TROPENMUSEUM_Een_grijze_gibbon_(hylobates_cinereus_mulleri)_Borneo_TMnr_10006733.jpg

The pileated gibbon (Hylobates pileatus) is a primate in the gibbon family, Hylobatidae. The pileated gibbon has sexual dimorphism in fur coloration: males have a purely black fur, while the females have a white-grey colored fur with only the belly and head black. The white and often shaggy hair ring around the head is common to both sexes. Hylobates pileatus is found in eastern Thailand, western Cambodia and southwest Laos.