The Saint Louis Zoo is a world-renowned zoo located in Forest Park, St. Louis, Missouri, United States. The zoo was founded in 1910 and is now home to over 13,000 animals from 555 different species, including mammals, birds, reptiles, amphibians, fish, and invertebrates.

The zoo is divided into six major areas: River's Edge, Discovery Corner, Historic Hill, Lakeside Crossing, The Wild, and Red Rocks. River's Edge features animals from different regions of the world, such as elephants, hippos, and lions. Discovery Corner is an interactive area where visitors can interact with animals and learn about their behaviors. Historic Hill features architecture from the 1904 World's Fair and is home to primates, big cats, and bears. Lakeside Crossing showcases animals from different habitats like sea lions and penguins. The Wild is an indoor area that features reptiles, amphibians, and invertebrates. Red Rocks is home to several species of primates, big cats, and birds of prey.

The zoo also has several special exhibits, including the Sea Lion Sound, Penguin & Puffin Coast, Primate House, and Children's Zoo. The Saint Louis Zoo is known for its conservation efforts and research programs. It is also free and open to the public, although donations are welcomed. The zoo attracts over 3 million visitors every year, making it one of the most popular tourist destinations in St. Louis.