Brookfield Zoo Official Litter Watcher

Green text and an illustration of an alligator head on a white background

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.