Ok now for an official on-topic answer.
My wishlist for an ALL-OUT-AFRICAN-EXPANSION would be:
1. Secretary Bird (Unique looking, like a eagle on stilts and this game needs more birds, desperatly)
2. Shoebill (Another bizarre bird that is unique in the world of appearances, and the game needs more birds.)
3. Generuk (The most bizarre antelope of Africa, game can't be complete without them.
4. African Porcupine (The big one, this game needs a spined-creature, they would be cool in the african savannah with giraffes and antelopes around,)
5. Honey Badger (They have character man! This little fellow has no fear, and would be perfect for this game.
6. Fossa (As my username may tell you, they are among my favorite creatures, bizarre and the biggest predators of Madagascar, they should be included!)
7. Serval (The cat version of the Maned Wolf, another bizarre animal that really needs to be covered!)
8. Chameleon, a big one. My favorite lizard-type, they are unique with their color-changing powers and bizarre movement/tongue.
I'm sure the White Rhinoceros/Black Rhinoceros will also be there, I don't mind it, but I'd rather see the animals above, also Meerkats, I would really like them, but they didn't fit my list, I like Porcupines more, because they look so bizarre and never been in a zoo-game before, while they are in every zoo in holland! (are their spikes a hell to animate in games?)
Other cool animals that I want are the small cute Fennec Fox, the beautiful most clean of pigs the Red River Hog, the funny and nimble Sifaka and Indri, the bizarre African Ground Hornbill and the water-loving Waterbuck.
Don't forget the biggest antelope called Eland (funny fact, in the Netherlands Eland actually is the name for the MOOSE, lol.)
The African Maned Mountain Sheep (forgot the name in English) is also cool, but I'd rather see the Markhor appear, my all-time favorite animal after the Cassowary and Giant Anteater.
Guineafowl could be a fun addition to be walking around with big mammals such as Wildebeasts and Giraffes.
Bat-Eared Foxes and Aardwolves are both bizarre and amazing, wouldn't mind them either!
Crowned Cranes are beautiful, but a bit overdone in my opinion. Hammerkop Birds are too small right?
For smaller reptiles and insects, those bird-eating Armored Bush Crickets are awesome, also the Black Mamba is magical. Does Africa has any Mantis? This game desperatly needs some MANTIS people!.
Damn, I kinda want the African pack to have 20 animals lol, just make it a full-out expansion, like Zoo Tycoon did all those years ago!
My nightmare is, more zebra's, more lions, more giraffes, more gorilla's, sub-species in general, who needs/wants them before more unique animals? The animal I like least in this game is the Bonobo Chimpansee for this reason, also I really dislike Chimps, scary human-like animals, ugh.
Baboons are cool and all, but Mandrills are better and I'd rather see Gelada's the mountain monkeys.
Nile Crocodile, another horror-scenario, I don't see a difference with Saltwater Crocodiles, but that's just me.
I know everbody LOVES the Leopard, but I don't want them, I already have my favorite Jaguar and Snow Leopard, don't need this rather bland family member.
While the Dikdik is cool, I'd rather see a small deer instead, the Musk Deer to be exact, the vampire of the deer world.