The AZA Ungulate TAG, in partnership with Disney's Animal Kingdom, has published a comprehensive manual of ungulate mixed-species exhibits. The list covers 650 exhibits from 131 zoos.
It can be downloaded here: Mixed Species Resources
Photo taken from raised viewing area near Rhinos of Nepal exhibit. View is across part of Passage through Asia drive-through section, shortly after a heavy rain shower. Père David's deer (Elaphurus davidianus); domestic yak (Bos grunniens); Bactrian camel (Camelus bactrianus).