Orcas in the wild have an average life expectancy of 50. No captive-born orca has lived to 30, and very few wild-caught orcas in captivity live much longer.
I'd say that's a fair basis for an argument in favour of not keeping them in captivity at all.
Honestly it feels incomplete with both rhinos and leopards missing, considering they're part of the Big Five. Can't really have a proper African safari without them, eh.For me its just Polar Bears, Penguins (either Emperor or African), Kangaroos, Jaguar/Leopard and a Black/White Rhino. The lack of the black rhino was a bit upsetting as there was so much evidence for it via signs/statues/etc. I didn't think I so desperately wanted "another" African animal until I was missing it. Indian Rhinos are cool but it makes African safari parks feel incomplete.