Abstract
Environmental complexity plays an integral role in the activity and psychological well-being of primates. The experiment described in this article evaluates the effects of nonintrusive, inexpensive, and easily managed behavioral enrichment devices on the behavior of a group of captive Western lowland gorillas. Devices used included cardboard boxes containing food items, paper bags containing food items, burlap rags, and willow and maple browse. The enrichment devices increased foraging, social play, and solitary play behaviors. Sedentary behaviors decreased. Rags, bags, browse, and boxes did not statistically decrease the incidence of regurgitation/reingestation or coprophagy. Depending on the type of enrichment item used, the effects on agonism and manipulation of enrichment item were variable. To make informed management decisions about the psychological well-being of captive animals, it is important to objectively quantify and examine the influences on their behavior.
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