When I want a more natural looking exhibit, I usually create a very tall, narrow mountain or a cliff with low fence at the top. Some animals can go up cliffs, so if they do, even putting post and rope fence should keep them in long enough for them to go back off the cliff. Just make sure you have one side of fence so guests can see. However, I do find using just fences is faster, more simple, and offer more controll in terms of placement. Ultimatly it comes down to how you feel about it and what you want the exhibit to look like.
Remember that no matter how you like it, you still have to have a COMPLETE fenced exhibit. 3 fenced walls and a row of mountains is not an exhibit and visitors will not donate to a non-exhibit (or animal not contained).
So the nice idea that cliffs/mountains are free (and more attractive) unfortunately doesnt work and you HAVE to build with fences - but to save money during scenarios always build with a $50 chain link fence.
Tor1269: Remember that no matter how you like it, you still have to have a COMPLETE fenced exhibit. 3 fenced walls and a row of mountains is not an exhibit and visitors will not donate to a non-exhibit (or animal not contained). So the nice idea that cliffs/mountains are free (and more attractive) unfortunately doesnt work and you HAVE to build with fences - but to save money during scenarios always build with a $50 chain link fence.
What!! That is not true. As long as the mountain is high enough and it connects to the fence, it still counts as an exhibit. In fact, I once had an exhibit that was 4 sides mountain, 1 side fence; and it was one of my largest and most popular exhibits.
Another benefit, of cliffs, is you can make a waterfall with them!