I know I already replied on this thread, but I have another weird mix I want to share, one were all three species while they live in somewhat similar habitats live in COMPLETLY different parts of the world and would never naturally encounter each other.
This mixed involved Malayan Tapirs, Giant Anteaters, and Southern Cassowaries in one habitat. And yet, even though none of them had any interspecies bonus with each other(as well as being very unlikely to tolerate each other in real life ESPECIALLY the cassowary) they cohabitated just fine. Granted, I made this mix a few years ago and I did it in sandbox mode so who knows how it will work nowadays.