The first ones are in order of the ones I desires most, but then it gets a little less precise.
1 - Walrus.
2 - Southern Elephant Seal. - But any Elephant Seal would be great.
3 - Coconut Crab. - Much Bigger than a Meerkat or a Prairie Dog, there's no reason not to be a habitat animal.
4 - Alligator Snapping Turtle. - If Platypus work, I don't see why they wouldn't work.
5 - Manned Wolf.
6 - Red-Faced Spider Monkey. - But any Spider Monkey would be great.
7 - Giant Armadillo - But any Armadillo would be great.
8 - Ocelot.
9 - African Crested Porcupine.
10 - Fossa.
11 - Black Howley Monkey. - But any Howley Monkey would be great.
12 - Tasmanian Devil.
13 - Lar Gibbon. - But Any Gibbon would be great.
14 - Golden Lion Tamarin.- It is not smaller than Colobian Withe-Faced Capuchin Monkey, has no reason to not be a habitat animal.
15 - Hamadryas Baboon. - But any Baboon would be great.
16 - Makhor. Do not forget to put the various possible Horn variations, please, it is essential.
17 - Musk Ox.
18 - African Leopard.
19 - Dromedary.
20 - Leopard Seal.
21 - Stryped Hyena.
22 - Caracal.
23 - Greater Rhea.
24 - Wolverine.
25 - Sumatran or Java Rhino.
Honorable Mention: Thilacine. It's getting closer and closer to proven that Thilacine isn't extintc, so here's this Honorable Mention.
Other animals considered: Honey Badger/Ratel, Bighorn Sheep, Greater Kudu, West Indian Manatee, Burrowing Owl, Emu.