Mammoth (rig to Civ V Elephant animations probably African Forest Elephant)
Smilodon (Sabre-toothed tiger) and other big cats (Puma, Leopard, Cheetah, etc) since these use the same animations.
Humpback Whale, Great White Shark, Orca (Killer Whale)
Orangutan, Chimpanzee (to complete the Planet of the Apes!)
Vulture (already done the animations for this with the Pteranodon)
Grizzly/Polar Bears (because they have a cool attack animation)
Wildlife Park 2 does have a decent looking Hippo and a Giraffe but I doubt I'm going to get to those myself to be honest.