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.
The range of the pileated gibbon is eastern Thailand, western Cambodia and southwest Laos. Its lifestyle is much like other gibbons: diurnal and arboreal, it lives together in a monogamous pair, brachiates through the trees with its long arms, and predominantly eats fruits, leaves and small animals. Reproduction habits are not well known, but are presumed to be similar to the other gibbons.
Rescue, Rehabilitation and Release of the Pileated Gibbon
The non-profit organization Wildlife Alliance has cooperated with the Cambodian government to conduct rescue and release programs for the pileated gibbon in Cambodia:
Rescue - A unique law enforcement team mandated to crack down on the illegal wildlife trade throughout Cambodia, the Wildlife Rapid Rescue Team confiscates approximately 5-6,000 live animals annually and has rescued more than 56,000 live animals from its creation in 2001 through 2013. Most of these animals are immediately released into safe habitat, and those who need temporary rehabilitation or permanent care are brought to Phnom Tamao Wildlife Rescue Centre. Gibbons are threatened by capture for the meat trade and pet trade in addition to threats by habitat loss. 
Rehabilitation - Most of the pileated gibbons at Phnom Tamao Wildlife Rescue Centre were confiscated from the illegal meat trade or pet trade, rendering them too humanized to be released. However through the center's breeding program in which mothers raise their own offspring, gibbons have been successfully prepared for life in the wild. 
Release - In December 2013 a pair of pileated gibbons were successfully released into the protected forests of the AngkorUNESCOWorld Heritage Site near the ancient temple complexes. This initiative by Wildlife Alliance, the Cambodian Forestry Administration and the Apsara Authority who manages the World Heritage site is the group's first step of many toward repopulating the formerly barren forests surrounding the famous Angkor temples.