I was just watching best in slot’s latest evolution video (botanical gardens) where he builds a open exhibit with one wall made out of rocks. And I wondered if we would be able to do something similar in planet zoo. Like we already know the monkeys will avoid swimming. So would we able to build a island where the monkeys stay on with only the water? (Okay it might be troublesome for your keepers.) Or maybe keeping your crocodiles contained with rocks. I think rocks are probably a better natural fence then water but I do hope both would be possible depending on the animal species.