We've a fella within 3 miles of us that had all kinds of exotics years ago.When we moved to this area 12 years ago; there were 4-5 llamas and a couple of zebra that wandered his 1/4 sq mi property.
These days I see only one lonely zebra and one llama.
Oh dear—I hope the animals lived to old age. Sounds like incompatible habitat could have been an issue. Also, 1/4 sq. mile doesn’t sound like much area for wild, exotic animals to roam.
I don’t know anything about raising exotic animals, and wouldn’t attempt it, but it seems logical that if the animals are placed in a non-native habitat / grazing area, lots of extra effort would be necessary to adjust or compensate, for instance, for their dietary needs.