@ossobuco,
I like some of the new-ish features of the Melbourne zoo. Actually they've been in place for quite a time now & there may have been further such developments, I'm not sure ....
The viewing public in the "cages" (or caged walk-ways) ... & the animals roaming a lot more freely that they would have, years ago.
Nothing sadder that seeing a large creature, like a lion, pacing, pacing, pacing in some restricted enclosure. Or an obviously depressed ape stuck in a small concrete enclosure.