If you check out the thread "Snowleopard's Epic Road Trip" there are reviews of exactly 30 different zoos & aquariums across North America, including the Pittsburgh Zoo. I was disgusted with the "Tropical Forest" building and it's awful, fake primate enclosures, and the bear grottoes are the worst of their kind. However, the children's zoo is enormous and worth seeing, and the aquarium is quite impressive. I'm torn on the "Water's Edge" exhibits as the polar bears have a lot of concrete to crawl over before hitting their pool. Overall I would rank it as one of the weakest zoos that I saw on my long summer road trip.