I'm going to be traveling from SC to PA to visit family. I'm thinking of visiting the National Zoo in DC and the Philadelphia Zoo to do some photography. I would appreciate it if any who are familiar with these zoos could tell me whether they are “photographer friendly.” For example, my online visits reveal that the Philadelphia Zoo has many wired enclosures for animals to move around. Great idea, but not so great for photography. Open areas are much better from a photographer's perspective. (I would especially like to get pics of a Komodo dragon.) If anyone can advise me as to whether a photographer is likely to get “clear shots” of a variety of animals at these zoos, I would much appreciate it. Thanks.