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8 of the world's most popular zoos

By: Katherine Butler on June 17, 2012, 5:37 p.m.

Photo: Wikimedia Commons

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Where the wild things are

For many animal lovers, zoos conjure images of depressed animals relentlessly pacing behind iron bars. But as attitudes have changed, so have the accommodations. As wildlife habitats across the planet have become more vulnerable, zoos have stepped up their work of preserving endangered species. Here are eight internationally respected zoos that are working to make life better for their residents — and their wild relatives. (Text: Katherine Butler)