Additional Resources for you to Explore
Stanford students ease life in the zooThrough a unique experience at San Francisco Zoo, Stanford students learn how to apply principles of animal behavior to design environmental enrichments that benefit both the animals and the complex mission of a zoo. 
Discussion: Is mental stimulation through environmental enrichment equally important as nutrition and veterinary care? Why or why not?

Are zoos good (yes) or bad (no)?Read the comments for and against zoos from this discussion on debate.org
What does it mean to live in an unnatural environment? Do humans live in unnatural environments?