Boars would be good... for a start.
After all, you've got huge expanses of almost untouched wilderness, but where's all the wildlife? We've got plenty of large carnivores, with multiple types of wolf, bear and cat, but not much else. Elk, rabbits, a couple kinds of fox, and hawks. That ecosystem needs diversity, badly. How about smaller deer, like white tail? Squirrels, raccoons? Owls and ravens. Turtles! Where are the turtles? Oh, and seagulls around the coasts (really,
hawks circling Solitude's docks? Come on...)
Likewise, the only fish we have are salmon, a multitude of what look like guppies (not even food fish, they're all alchemy ingredients

), and slaughterfish (which is just
mean since we can't fight underwater anymore).
I know this is just getting greedy, and making all that, then placing it in the world (and maybe including cooking recipes) would be waaaay more work that anyone sane would want to do. But boars would definitely be a good start.