This link takes you to the Zoolex page for this exhibit, detailing its layout, features and other information: ZooLex Exhibit
It is a very big exhibit, and as such is open topped.
Zoolex says that "The exhibit is fenced by three to four meters high shotcrete walls, as well as by 4 meters high fences with a one meter overhang, and glass and piano wires at the view points."