Sprawling over 69 acres of a 220-acre natural rainforest, this zoo has stunning views of nearby reservoir lakes. Wet or dry moats are used to separate the animals from the people. A mere 3-foot-deep moat, for instance, will keep humans and giraffes apart, since a giraffe's gait makes even a shallow trench impossible to negotiate. A narrow water-filled moat prevents spider monkeys from leaving their home turf for a closer inspection of visitors. The zoo uses massive glass viewing windows to great effect: not only can you watch polar bears perform "ballet" underwater and pygmy hippos do less graceful things, but you can also observe such big cats as lions and jaguars close up. At the reptile house, be sure to seek out the Komodo dragons, which can grow to 10 feet in length. The primate displays are striking, too, and the orangutan enclosure shows off the world's largest captive orangutan group. In all there are about 3,000 animals from around 300 species here.