They're not in the north America section anymore (which is actually a blessing, since their old enclosure was horrible for photos and getting down there was murder on my legs!) They are in the newer Tundra Trek with the polar bears and foxes. Their home is much more open so the public can view them much easier, despite being farther away. There are even many spots where the fence does not get in the way of the shots.
I miss them too I want to get some winter shots while there's actually snow