 Additional exhibits were constructed over the years, and in 1963 the city hired its first zoo director, Gary K. Clarke.The first major facility at the zoo was constructed in 1966 to house large mammals.Clarke went on to get many of the current exhibits constructed, including Gorilla Encounter (1985), the temporary Koala Exhibit (1986), Lions Pride (1989), the Tropical Rainforest, and Discovering Apes.