In spirit with the original intent of the thread, I'll stick to one animal per zoo, and stick to the Cenozoic, but I'm gonna stretch the definition of "home zoo" by a few kilometers; let's say zoological parks I can more-or-less easily travel to without taking a plane.
- Barcelona zoo (real home zoo): A bit difficult to add anything to the cramped zoo, but if I think the area of the former Aquarama could make a good area to exhibit Chalicotherium goldfussi, a classic European extinct mammal that would cope well with the heat.
- Bioparc Valencia: To enrich its Madagascar area, I think adding a paddock for the elephant bird (Aepyornis maximus) would be a great idea.
- Oceanografic Valencia: There's no better animal to keep in the former walrus exhibit than the great auk (Pinguinus impennis) (Though I was also considering the dodo for the islands, and the Steller's sea cow in an outdoor exhibit)
- Reserve Africaine de Sigean: The guide states they eventually want to phase out the Asiatic black bears to focus on African fauna. As sad as that is to me... Megantereon whitei would be a great substitute, being the premier African sabretooth cat.