The Berlin Zoo is the oldest and most-visited zoo in all of Germany. In collaboration with its associated aquarium, the area is made up of 84 acres and home to over 17,000 animals. The zoo was established with the help of King Frederick William IV of Prussia, who populated the zoo with 850 animals from his very own private collection. It suffered massive damage during World War II, when most of the zoo and almost a hundred animals were destroyed. However, the zoo was rebuilt and the survivors—a pair of lions, hyenas, a bull Elephant, almost a dozen baboons, and a chimpanzee—moved into more natural enclosures and tours, one of which became the Animals of the Bible tour, showcasing animals from biblical reference.