Gibbons are the only truly monogamous apes, living in long-term pair bonds and defending territories with elaborate duet songs. Their welfare in captivity depends critically on appropriate social pairing and space for brachiation.
Gibbon welfare in captivity hinges on three interconnected factors: appropriate social pairing, adequate space for brachiation, and expression of natural vocalisation. Solitary gibbons show chronic stress and stereotypic behaviour. Incompatible pairings create ongoing aggression stress. Enclosures without adequate horizontal brachiation space deny the most fundamental locomotor behaviour. Song suppression — whether through inadequate pair bonds, stress, or management interference — indicates welfare compromise in a species for whom singing is central to daily life. Modern gibbon facilities provide large, interconnected climbing structures, stable family groups, and appropriate acoustic environments. The challenge of managing gibbons from critically endangered species with small managed populations requires careful genetic and welfare balancing.