multi species habitats

Currently they can't be held together. I tried recreating my local Safari zoo, and was dissapointed to discover they will fight. Here is a picture of all animals together at the zoo: Hippos in general work well in Safari habitats with all animals ingame, so I don't understand why the rhinos...

I know people have made charts and documentations of which animals can technically exist together. But what are your favorite combos? What discoveries have you made? What animals look best together, or at least make a decent amount of sense? I'm not discounting all animals from Africa. It's just...