Good call. Southeastern wetlands (U.S.) is definitely a category I would like to see represented, both with foliage and animals.
One small criticism would be, as alligator snapping turtles don't normally spend time outside water and that they don't move as much, I see them being XL exhibit animals.
Due to the same reasons (exhibit animals only having idle animations) any slider, including red eared sliders would be unlikely as they are very active turtles. Even though I love sliders, unless they overhaul the entire exhibit system, I don't see them making it in.