Well the only thing really not natural about this display would be the rocky back-drop as those are quite few and far between in Central Africa, but Sitatungas and Bongos do come into contact with each other in the wild in the bais and marshy forests, and isn't this exhibit supposed to represent a bai? Though I also don't exactly like that the species are exhibited together with the risk of them breeding, I think it's nice that a zoo is trying to represent a habitat that is usually not represented besides as an "African Rainforest" exhibit.
Well the exhibit definitely it's not very leafy.
In the other hand: the bongos are with duikers and black-necked cranes, but the sitatungas are with pygmy hippos, mona's monkeys and Nile geese.
