I leave the fencing as iron-bar until the animals start to feel crowded (unless they're usually shy, in which case I start with the rock wall) because the more the guests see happy animals, the happier THEY are!
As guests pass the great cats, they will come to a corner where they see Mandrills on their left, and an Okapi/Bongo mixed exhibit straight ahead. Because the Okapi are so picky, their exhibit suitability is at 99%, while the Bongos have an 89% suitability. Animal happiness for both species is 100%, and both have had babies
Continuing around the corner, the guests will see a rest area with an animal theater, playground for the kids and restaurant...
...and a chimpanzee area on their left.