Imagine an area shaped like an oval with the long side going left/right. I want to split that length ways down the middle with a guest path and create a lion habitat and a leopard habitat. Halfway down the path, I want to add shelters with a viewing window for each. I'd like to cover the shelter with rocks to look like caves. My question is: do I need fencing up and over the "mountain" to keep them from escaping from one to the other? If so, how, as I have fencing on the ground with the viewing windows. I don't think it would look right with really tall fencing (again, with the viewing window). Any suggestions are welcome. Thanks ahead of time.