Discovering Apes Building opened in two phases between 1981 and 1985. The Orangutan exhibit was completed in 1981 and provides a unique experience for the visitor to view animals at tree-top level.

In 1985 the Gorilla Encounter exhibit opened to the public. Visitors can enjoy an interactive experience as they walk through a glass tunnel, one of the first of its kind, and examine the Gorillas habitat.

The zoo opened the Outdoor orangutan habitat in June 2003. It provides an opportunity for the zoo's Borean orangutans to be outside weather permitting.