Black rhinos are said to be quite aggressive, and most mixes I have heard of use white rhinos. Ibis will also not do well flight restricted in a paddock with large animals, I think.1. Black Rhinos, Ibis, Grevy’s Zebras
Has been done before, eg. Omaha.2. Ostriches, Impalas, Giraffes
Seals and sea lions are known to eat sea birds, so this would be possibly risky. The seal and sea lion mix should be fine.3. Harbor Seals, California Sea Lions, Puffins
Done before, eg. Chester.5. Ant-Eaters, Capybaras
I don’t see any problem with this one.7. Indian Peafowl, One-Horned Rhinos