The Cincinnati Zoo & Botanical Garden is the second oldest zoo in the United States, founded in 1873 and officially opening in 1875, after the Roger Williams Park Zoo (1872). It is located in the Avondale neighborhood of Cincinnati, Ohio. It was appointed as a National Historic Landmark in 1987. The zoo is known for being the home of Martha, the last living passenger pigeon, and to Incas, the last living Carolina parakeet.