Pileated gibbons have been extirpated or hunted to extinction locally in the forests of Angkor for many decades. Reintroduction programs, such as the one we are working on in conjunction with the Forestry Administration and APSARA Authority, to re-wild the forests of Angkor, a UNESCO World Heritage site, are an example of an Endangered species breeding program working to reintroduce species to habitats they once occupied. This program has also highlighted the suitability of captive-born animals for release programs, with one third of the released pairs being captive born. Previously, it has been postulated that captive-born individuals would not be suitable for release due to the potential loss of innate behaviours or the lack of fear response to humans. However, we have determined that with strict reintroduction protocols for captive-bred individuals, including providing rehabilitation enclosures that stimulate natural behaviours and allowing mothers to raise their offspring with limited human contact, captive-bred animals are able to exhibit wild behaviours necessary for their survival in the wild.