Lincoln Park Zoo is a 35-acre zoo in Lincoln Park, Chicago, Illinois. The zoo was founded in 1868, making it the fourth oldest zoo in North America. It is also one of a few free admission zoos in the United States. The zoo is an accredited member of the Association of Zoos and Aquariums.
Lincoln Park Zoo is home to a wide variety of animals. The zoo's exhibits include big cats, polar bears, penguins, gorillas, reptiles, monkeys, and other species totaling about 1,100 animals from some 200 species. Also located in Lincoln Park Zoo is a burr oak tree which dates to 1830, three years before the city of Chicago was organized.