The Brookfield Zoo is a zoo located in the Chicago suburb of Brookfield, Illinois. The zoo covers an area of 216 acres (874,124 m ) and houses around 450 species of animals. Brookfield Zoo, also known as Chicago Zoological Park, opened on July 1, 1934 and quickly gained international recognition for using moats and ditches, instead of cages, to separate animals from visitors and from other animals. The zoo was also the first in America to exhibit giant pandas, one of which (Su-Lin) has been taxidermied and put on display in Chicago's Field Museum of Natural History. In 1960, Brookfield Zoo built the nation's first fully-indoor dolphin exhibit, and in the 1980s the zoo introduced Tropic World, the first fully-indoor rain forest simulation and the then-largest indoor zoo exhibit in the world. Perhaps the most famous resident of Brookfield Zoo was Ziggy, a 6.5 ton bull elephant that was kept in an indoor enclosure for nearly thirty years after it attacked its trainer in 1941. During the 1960s and 1970s, Ziggy attained a cult following in the Chicago area, and the elephant was finally released in 1970 amid much fanfare.

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