In 1980, the zoo's Master Plan was put into effect. This plan called for extensive renovations and the construction of more naturalistic exhibits. The Asian Forest, which opened in 1983, was the first area of the zoo that utilized this new philosophy of naturalistic exhibits. The African Savanna was the next area to obtain naturalistic exhibits when it was completed in 1987. 1991 marked the opening of the Tropical Forest, a five-acre indoor rain forest showcasing about 16 species of primate and 150 tropical plant species. That same year, the Children's Zoo was renovated and renamed the Children's Farm. Three petting zoos were built in Children's Farm where children could pet kangaroos, deer, and domesticated animals such as sheep and goats.