The massive institution is home to more than 5,000 creatures in myriad exhibits, including an outdoor baboon reserve, a sea-lion pool and an exhibit dedicated entirely to Madagascar. Visitors can ride the Wild Asia Monorail, which tours 38 acres of exhibits that house elephants, Indo-Chinese tigers, deer, antelope and Mongolian wild horses, or wander over to see two gargantuan Nile crocodiles. Amphibian fans can also read about the Wildlife Conservation Society's efforts to save the Kihansi spray toad, a species now extinct in the wild.