The Minnesota Zoo (formerly the Minnesota Zoological Gardens), is an AZA-accredited zoo in Apple Valley, Minnesota. When it opened on May 22, 1978 it was fairly revolutionary in its exhibit design. The zoo, built in a suburbanizing rural area, had more space to house exhibits and was one of the first zoos to organize its animals by their living environment as opposed to their species. Exhibits are arrayed in six themed areas, including three themed walking trails ranging from one to two miles in length: