I actually really like this particular grouping by
@yoav_r because I think the "non-tropical South America" meta-region makes it worthwhile to discuss these three together in particular. Besides the spectacled bear, the three most discussed habitat animals from this meta-region (rhea, mara, and vicuna/guanaco) are covered in this grouping. In a way, this is an opportunity to weigh how much of the forum's desire for those species is motivated by the need to finish their region vs. their taxa.
For me personally, I don't think a rhea is necessary given we have all the rest, especially if we get the mara. But I do get the appeal of a rhea thrown into non-tropical South American mixed habitats, so I would take one over a second camelid (the llama, while very biogeographically distinct from guanaco and vicuna, suffices for the purposes of zoos, IMO). Hence...
Camelids: if I'm trying to be objective, I think the
dromedary is the only "essential". Finish non-tropical South America with other taxa IMO. If I had to tier it, I'd have dromedary at A and the rest at C (alpaca at D).
Ratites: for me, #1 priority is the
kiwi (pref.
North Island brown), an S-tier for me. Iconic, a brand new geography, morphologically and behaviorally unique. Rhea of either species would be B, more for completing its region.
Rodents: the one I've already discussed - mara - is a B for me, similar to rhea. Of potential habitat mammals, any Old World porcupine would be an S-tier need for me, and maybe my #1 most "objectively" essential mammal. I have a strong preference for the
Indian crested porcupine to add to the lackluster smaller animal roster for India/Middle East. Porcupines from the Americas are a C for me, but if we can't get an Old World one, bump these to S. We need a porcupine of some kind.
I'd actually rate an agouti of any species on par with the mara, because even through the Neotropics have a little more representation than Patagonia, they're diverse enough to deserve more small mammals.
The gamechanger in rodents is if we get exhibit mammals, in which case my top picks would be:
1. Long-tailed chinchilla (one of the few morphologically unique adds possible for non-tropical South America)
2. Naked mole-rat (but with all their range of behaviors)
3. Malagasy giant jumping rat (with one or two other Malagasy exhibit like a chameleon, and the fossa, this would give us an incredible Madagascar roster)
4. Indian giant squirrel (my #1 pick for a non-flying squirrel species over Prevost's because of its size, color and the need for more small stuff from India)
Excluded lagomorphs from this list.