Behavioral enrichment, also called environmental enrichment, is an animal husbandry principle that seeks to enhance the quality of captive animal care by identifying and providing the environmental stimuli necessary for optimal psychological and physiological well-being.  The goal of enrichment is to improve or maintain an animal’s physical and psychological health by increasing range or number of species-specific behaviors, increasing positive utilization of the captive environment, preventing or reducing the frequency of abnormal behaviors such as stereotypical behaviors, and increasing the individual’s ability to cope with captive challenges.  Source: Wikipedia