Animal Enrichment at the Smithsonian's National Zoo and Conservation Biology Institute

Enrichment gives animals a creative outlet for physical activity and mental exercise, as well as choice and control over how they spend their time. Some of the animals' favorite enrichment toys are ones that roll, wobble and are just fun to pounce on or chase.
Other examples of enrichment include puzzle feeders that encourage animals to forage for food, climbing structures that enhance habitats, and training sessions where animals can interact with keepers.
Enrichment keeps an animal's day interesting and is just as essential to animal welfare as nutrition and veterinary care!