As shown in the images below, I've been using paths themselves to contain smaller non-climbing animals by having null barriers branch off a keeper gate and following the path around. I like the results a lot and it made me think of new kinds of habitats. Not seen many people doing it (I guess because you can't really share your results in the workshop). If you've done this though, would enjoy seeing what you've come up with...
Pygmy Hippo Habitat:
Pygmy Hippo Habitat:
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