Pretty much the whole Disney's Animal Kingdom safari exhibit. Predators on one side and prey on the other. The Greater Flamingos and Nile Hippos are in one pond on one side of the road and the Nile Crocs are on the other. The rest of the Predators/Prey animals can walk up to the border of the two anytime they want to.
The flamingos are in their own area near the elephants, not with the hippos (Zoo Tycoon 2 much?) Also, while the lion and cheetah exhibits on Kilimanjaro Safaris is a predator-prey setup, the crocs are enough separated from everything else that there is no visual connection. The tigers on the Maharajah Jungle Trek also have a predator-prey setup with the banteng, Eld's deer, and blackbuck.