Experience a Unique Encounter with Nature at the Brookfield Zoo Connect with nature and wildlife at the world-renowned Brookfield Zoo. Managed by the Chicago Zoological Society and set within a 216-acre nature park, this popular Chicago attraction has captivated and educated visitors since 1934. Today, the zoo is home to over 2000 animals and is also an accredited arboretum. The Brookfield Zoo is open every day and welcomes more than two million guests each year. In addition to the animal exhibits, the zoo also hosts a myriad of exciting events, including paint nights, concerts, and more.