The effects of visitors and social isolation from a peer on the behavior of a mixed-species pair of captive gibbons
Abstract Human visitors affect the behavior of captive animals, which is the so-called visitor effect.The number and behavior of visitors may influence stress-related behaviors in captive animals, such as self-scratching, yawning, and visitor-directed vigilance.A social group setting can be applied to alleviate such negative visitor effects and fac