time as plants are added and occasionally trimmed so as to not completely block out the sunlight. The exhibit added more than 150 animals to the zoo and is currently highlighted by jaguars, Baird's tapir, bats, black howler monkeys, squirrel monkeys, prehensile-tailed porcupines, Arrau turtles, Cuvier's dwarf caiman, and several fish species from the Amazonian River system. The open spaces of the exhibit also function as a free-flight bird aviary, and house over ten species of birds. Penguins of Patagonia Penguins of Patagonia is an outdoor humboldt penguin exhibit. North America North America includes a large Mexican gray wolf enclosure. Discovery Center The Discovery Center is an indoor/outdoor exhibit that focuses on conservation, education, and endangered species. It also houses the zoo's education department and many of the animal used in educational programs. This exhibit contains Francois' langur, red pandas, hyacinth macaw, ocelot and several smaller reptile enclosures. Of particular note is the hellbender salamander exhibit, where the zoo displays and raises juvenile eastern hellbenders as part of a statewide conservation program, in association with Purdue University and the Indiana Department of Natural Resources. Lemur Forest Lemur Forest was opened in 1999 to house the zoo's lemurs. It currently holds three species: ring-tailed lemurs, red ruffed lemurs and Coquerel's sifaka. African Rift The African Rift area includes reticulated giraffes, Grant's zebras, sitatunga, and white storks in large open areas. In July 2018, the zoo welcomed a new 10-month-old giraffe named Clementine. Kley Building The Kley Building was built in the 1950s and houses several exhibits. The upper floor contains a newly renovated nocturnal exhibit, a reptile exhibit hall featuring rhinoceros iguana and Komodo dragon, and a hall used for meetings or special events. The lower floor contains the indoor portion of the zoo's Indian rhinoceros exhibit. This floor was once home to Bunny, an asian elephant, and Donna, formerly the world's oldest living captive hippopotamus. Donna was euthanized at the age of 60 in 2012, because of age-related failing health. A small statue of Donna was constructed by the Zoo's Panorama playground in her memory. Asia & Australia This area reproduces habitats for Asian and Australian animals. It includes the outdoor exhibits for the zoo's Indian rhinoceros, as well as Bactrian camels, Siberian tiger, Malayan sun bear, Sichuan takin, laughing kookaburra, and emu. Children's Enchanted Forest This exhibit is geared towards children and contains several playground elements and a seasonal