For an African pack 2, I would go with:
1. Dromedary
We already have the sign, and we don't have an African camel yet.
2. Hamadryas Baboon
No baboons yet and I find Hamadryas the most interesting looking.
3. Secretary Bird
More birds! And let's be honest, the secretary is the coolest.
4. Aardwolf
I know some people don't want any more dog-like animals, but this is such a cute and unique looking species, I just love them!
5. Red River Hog
More piggies, please! I'd love both this and wild boars added to the game.
6. Crested Porcupine
Really interesting animal and would make for a nice unique model.
7. Marabou Stork
Assuming we get an Asian variant of the Leopard, I'd take another bird! I'll go with the marabou, because my kids like it because of a Barbapapa book.
8. (E) Any chameleon
Iconic animal and something completely different from what we have so far.
There are lots of others I could imagine. There is pretty much no list in this thread I would not insta-buy.

Africa has so many amazing animals.