Unusual behaviour of captive-raised gibbons: implications for welfare

Unusual behaviours not normally seen in the wild were studied in 52 captive agile (Hylobates agilis albibarbis) and 23 Mu¨ llers gibbons (H. muelleri spp) at three locations within the Kalaweit Gibbon Rehabilitation Project. Unusual behaviours included stereotypic behaviour (SB), human-directed masturbation and posterior presenting. These data were collected over 18 months as part of […]