Abstract
Agonistic behavior of captive monkeys in cage is more frequently than wild monkeys. According to the previous researches, visual barriers of environmental enrichment can effectively reduced the agonistic interaction. However, the few researches indicated that visual barriers can increase the aggression. The purpose of this study is to discuss how different levels of visual barriers were effective in reducing agonistic behavior in seven groups of Taiwanese Macaques in Pingtung Rescue Center. Males that had occurred contact aggression and displacement behavior were significant higher than females. Females that had occurred bared-teeth and present display were significant higher than males. High rank monkeys had more hostile behavior and aggressive behavior, and low rank monkeys had more submissive behavior. In all behavior data, contact aggression had the low percentage. In the behavior sampling data, the agonistic behavior and degree of visual barrier had negative correlation; in other words, high levels of visual barrier, obtained 50%, conduced to the decrease of aggression of monkeys. In rate of sex and population density, they were no significant relationship with the average number of agonistic behavior.
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