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Brookfield Zoo opened in 1934 in Brookfield, Illinois and cares for 450 different species of animals. This is the first zoo in the U.S. to exhibit a giant panda and the first to build an indoor dolphin exhibit. They also built Tropic World, which includes the first indoor rainforest simulation.
Brookfield Zoo. (2018). Retrieved from https://en.wikipedia.org/wiki/Brookfield_Zoo.