No offense but this feels like willful pedantry. The original question was pretty clearly asking about a hypothetical pack from either region, which would, once again, follow the same rules as those established in-game. And I'd also like to point out that real zoos make the same "oversight": the Bronx Zoo's Tropic Zone and Minnesota Zoo's Tropic Trails both house almost entirely tropical rainforest animals. Honestly, though, the developer's aren't stupid -- they chose to use innacurate terminology for some inscrutable reason -- and hey, no one goes around criticizing them for the habitat/exhibit distinction, despite both referring to the same thing in real life.