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About Brookfield Zoo Brookfield Zoo is known throughout the world for its innovative, naturalistic, multi-species exhibits, its international role in animal population management and wildlife conservation and its devotion to helping people develop a sustainable and harmonious relationship with nature. Hailed as America's first "barless zoo" when it opened in 1934, Brookfield Zoo sits on 216 acres just west of downtown Chicago, and is home to more than 2500 animals.