I doubt that we'd get a pack focusing entirely on rodents (I expect the capybara and beaver to happen at some point, however). But that doesn't stop me from making a list:
1. Capybara - The capybara is literally the most popular animal on the forum. Not adding this animal would be grave error on Frontier's part (one that they've technically already made).
2. American Beaver - A semi-aquatic North American rodent. Three things that we currently lack. Dam-building would be a bit tricky however. Also included in Zoo Tycoon 2's base roster, so that has to count for something, right?
3. Crested Porcupine - A pretty popular species from what I've seen, and I can understand why.
4. Black-Tailed Prairie Dog - Probably the smallest species on this list. The rumours about meerkats getting into the game could open up the possibility of this animal, as they aren't too dissimilar. Also adds another animal to the American prairies.
5. Patagonian Mara - More South American animals are always appreciated. Also could work in more kid-friendly areas of zoos.
6. Brazilian Porcupine - Another porcupine? Why, yes. The Old World and New World porcupines aren't actually all that closely related. Aside from that, the two species on this list are almost nothing alike in most categories (Biome, Continent, Behaviour, etc.). I say we should have both.
7. Black Giant Squirrel - I would put the Indian Giant Squirrel on this list, but it doesn't seem to be kept in zoos. This is a stand in for that species, while also adding to the variety Southeast Asian animals to the game.
On a side note; I said before that I don't find a rodent-exclusive pack all that likely. However, I could see a small mammal pack with other types of small critters. This could be one of the ways we can get the ever so popular Asian Small-Clawed Otter.
