From left to right: These 2 aviaries are themed 'Arid Regions'. The one in the front houses Madagascar Fody (Foudia madagascariensis), Speckled Mousebird (Colius striatus) and Rock Hyrax (Procavia capensis). In the same aviary I also observed Beautiful Fruit Doves (Ptilinopus pulchellus) which don't really belong in 'Arid Regions'
Any way, next aviary houses Red-Billed Hornbills (Tockus erythrorhynchus), Burrowing Owls (Athene cunicularia), Northern Bald Ibises (Geronticus eremita) and Elegant Crested Tinamous (Eudromia elegans). The third aviary before the 'big dome' is part of the 'Tropical Rainforest' section and houses Wreathed Hornbills (Rhyticeros undulatus). See my picture 'Renovated Birdhouse 1' for further details about the other aviaries.