....and it is now a racoon exhibit - with a great deal of foliage in it (these rather nasty murals are invisible). The Arctic foxes are to be found in a simple, fenced paddock, nearby (and very nice it is too).
Thanks @carrie - bu you appear to be muddling the Bronx Zoo, where I believe the last Polar Bear died a while ago (and where the erstwhile Polar Bear enclosure now houses Dhole), with Brno Zoo, in the Czech Republic, where there is currently at least one Polar Bear still living.