"One of the largest in the world"

http://uwepetercom.blogspot.com/2010/04/one-of-largest-in-world-zoo-diego.html
Zoo | San Diego | California | USA | 2010-04-02
The San Diego Zoo in Balboa Park, San Diego, is one of the largest and most progressive zoos in the world, with over 4,000 animals of more than 800 species. It is also one of the few zoos in the world that houses the giant panda.