That's very fair and I can understand wanting more than just a sloth to feel like you can call your South American section complete. Interestingly enough I have 4 other mammals from South America in my top 15 mammal wants aside from the sloth. A Mara and a Coati as you mentioned, and for me the Spectacled Bear and Tayra (the last of which I certainly doubt would come to the game). Heck, the Spectacled Bear is well entrenched near my top 5 for that list, not too far behind the Sloth.To be fair, without any aviary birds, we'd still need the following for a "realistic" south america section:
That's already more than a dedicated animal pack, and these are just the "common in zoos" animals, without even counting rarer stuff, aviaries and exhibit animals.
- Any coati
- Any sloth
- At least 2 tamarins/marmosets
- An agouti
- A spider monkey
- A howler
- A squirrel monkey
- Mara
- A rhea
I hardly see SA getting close to complete in the game.
To me, South America is the continent that needs the most additional animals compared to what we have now. The variety and abundance of animal life that could be represented is astonishing. But for me, it's down to 1 critical mammal and that's the Sloth.
Edit - 1 critical Mammal, not animal - South America will never get close to complete without the robust bird life there.