Took me quite the number of hours, but at this point in time I have an every species and highly detailed zoo up to date through the new Oceania pack. Been in process for a couple years now, this is the third fourth detailed zoo I've done since launch, but the only one I've continue to update with every DLC.
If there is interest, I could start a thread showing off this zoo. As you can see, I've used EPCOT as inspiration like the World Showcase Lagoon. This zoo features 16 different "lands" so to speak, roughly by geography/biome from the entrance at the bottom clockwise: Asia, Australia, Africa, Europe/Middle East, North America, South America.
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It has been fun trying to incorporate DLC species into areas that I previously didn't build out for, and since I've started to leave some expansion plots throughout the zoo to build new exhibits for potential new species. This zoo started with a hand drawn concept, my own master plan if you will, and evolved since then. I think I started this just after the Southeast Asia animal pack, so anything newer than that I've had to fit in on the fly. It's really been the Wetlands pack on that I've had to go back and edit previously built parts of the zoo as only half of the map you see above was built prior to that pack.