The 163-acre Smithsonian National Zoological Park in Rock Creek Park was established by an Act of Congress in 1889 “for advancement of science and the instruction and recreation of the people.” It is a world leader in exhibition, conservation, zoological research, and education. The National Zoo is home to more than 5800 animals. It was the first zoo established with the purpose of saving animals on the brink of extinction. Today, nearly 130 of the Zoo’s species are endangered or threatened. The Zoo participates in 40 of the 70 Species Survival Plans coordinated by the American Zoological Association to ensure the survival in zoos of populations of endangered species.