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An Asian elephant in a zoo manipulating a suspended ball provided as environmental enrichment.

Environmental enrichment, also called behavioral enrichment, refers to the practice in animal husbandry of providing animals under managed care with environmental stimuli. The goal of environmental enrichment is to improve an animal's quality of life by increasing physical activity, stimulating natural behaviors, and preventing or reducing stereotypical behaviors. In principle, enrichment can be beneficial to any relatively intelligent animal, including mammals, birds, and even octopuses.^[1]

Environmental enrichment may be offered to animals in the following situations:

• Captive animals in zoos and related institutions.
• Animals in sanctuaries.^[2]
• Animals used for research.

Any novel stimulus which evokes an animal's interest can be considered enriching, including natural and artificial objects, scents, novel foods, and different methods of preparing foods (for example, frozen in ice). Puzzles that require an animal to solve a simple problems in order to access food or other rewards are considered enrichment. An animal's environment may also be enriched by the presence of other animals of the same or different species. A stimulus can be considered enriching even if the animal's reaction to it is negative, such as with unpleasant scents, although stimuli that evoke extreme stress or fear should be avoided, as well as stimuli that can be harmful to the animal.

Enclosures in modern zoos are often designed with enrichment in mind. For example, the Denver Zoo's exhibit Predator Ridge allows different African carnivore species to rotate among several enclosures, providing the animals with a larger environment and exposing them to each others' scents.

1. ^ Octopus enrichment program. Smithsonian National Zoological Park. Retrieved on June 11, 2006.
2. ^ Ron Hines, D.V.M. (2006-04-24). Synopsis of the Environmental Enrichment Program of 2nd Chance Sanctuary. Retrieved on June 11, 2006.

• Laboratory Animal Refinement Database
• Animals in Laboratories (awionline.org)
• 3R Research Foundation Switzerland (forschung3R.ch)
• Animal Welfare Information Center (nal.usda.gov)