Phoenix Zoo

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Oustanding zoo -- considered by many to be one of the top zoos in the nation.

We have approximately 2.5 miles of walking trails. Please note that In many of our natural habitat exhibits the animals can be difficult to see and visitors may be required to spend more time in observation. The Zoo has been divided into four different trails; usually the Africa and Tropics Trails take about an hour each and the Arizona and Discovery Trails take about a half hour each. We recommend approximately 2 and a half to 3 hours to see the Zoo, depending on the size and ages of your group, and how fast you walk.

Source:
http://www.phoenixzoo.org