making the Audubon Zoo popular not only with locals but also drawing substantial numbers of tourists visiting from other states and nations. In 1987, an alligator nest was discovered with 18 freshly hatched babies with white hides—an extraordinary natural mutation called leucism, not to be confused with albinism. They received much attention when they went on display, and the white alligator became a symbol of the zoo. In 1990, the Audubon Nature Institute, which manages the zoo, opened Audubon Aquarium of the Americas in the CBD at the edge of the French Quarter. Some of the white alligators were transferred to there, and a riverboat began service taking visitors between the facilities. The WPA-era Monkey Hill, a favorite landmark of generations of New Orleans children, underwent extensive renovation in the early 21st century, including the addition of a waterfall for young children to play in, a rope web that goes to the summit, and a high "safari outpost" at the base of the hill. For the sake of posterity sake, a portion of it was left as grass for children to play. In 2005, Hurricane Katrina hit New Orleans, followed by severe consequences in the devastating aftermath of the storm. During the hurricane, zoo staff found refuge in the reptile house, which was designed to withstand major weather events. Located on high ground atop an old natural river levee, the building was not flooded. Most of the animals survived—only three died—and the only major damage was downed trees. However, the zoo was short on food and other necessities in the days after the storm, and pumps were overheating. The fact that the zoo sustained only minor damage can be attributed to disaster planning and its location on high ground. Zoo curator Dan Maloney was quoted as saying, "The zoo had planned for years for the catastrophic storm that has long been predicted for New Orleans." The zoo reopened for Thanksgiving weekend in November 2005 and initiated a weekends-only schedule due to financial constraints. On March 1, 2006, it began a Wednesday through Sunday schedule, and eventually expanded to Tuesday through Sunday. For a period around 2011 the Lycée Français de la Nouvelle-Orléans (LFNO) used three rooms at the zoo as classrooms on a temporary basis. On 14 July 2018, a jaguar named Valerio escaped through the roof of its enclosure, killing six animals and injuring another three before being recaptured.