I really appreciate you posting this! Best Exhibit of the year in 2007, and probably the one and only section of the Philadelphia Zoo that is hailed as being world-class. Philadelphia has a great animal collection, but I've heard from many ZooChatters that the exhibits are a little disappointing overall.
Yeah, this is probably the only world class section, although the new avian center is very nice, and there are plenty of good exhibits. I would say this zoo is similar to the National Zoo in terms of overall exhibit quality.