engage in research and scientific development to conserve apes in the wild. Notable residents of this exhibit include Kwan, the current silverback in the zoo's gorilla troupe who appeared in the film "Return to Me" as Sidney, a chimpanzee named Optimus Prime, after the fictional character of the same name, and formerly Keo, the oldest male chimpanzee in a North American zoo at the time of his death in September 2013 at fifty-five. Custom-made stuffed animals of Kwan and Optimus in their likenesses are available in the zoo's Wild Things gift shop. Chimpanzee Western lowland gorilla Pritzker Family Children's Zoo The new Pritzker Family Children's Zoo, which opened in 2004, features a number of native eastern American wildlife, and lets visitors of all ages connect with the wild creatures in our own backyard and engages them to think about how species survive in the wilderness. Small amphibians and reptiles are featured in a small indoor exhibit, along with a leaf-themed climber play area for youngsters designed by Tom Luckey, with slightly larger indoor exhibits for birds and reptiles and large glass windows on each end so guests young and old can watch American beavers and the popular North American river otters swim gracefully underwater at eye-level in their outdoor habitats, with educational displays about how beavers build dams. Outside the building there are many areas where local birds nest. The building is surrounded by small outdoor viewing areas for the same otter and beaver habitatss. There are two significantly larger exhibits surrounding the path around the building for the black bear and the endangered red wolf featuring heavy foliage and a naturalistic stream, allowing visitors to go eye-to-eye with the animals or for the animals to hide in the foliage. Statues of gray wolves and signs encourage guests to practice howling and teach them about wolf pack dynamics. American black bear American green tree frog American toad Blanding's turtle Common walkingstick Eastern box turtle Eastern screech owl Midland painted turtle North American beaver North American river otter Red wolf Spotted turtle Wood turtle Kovler Seal Pool One of the zoo's most popular exhibits since its first iteration in 1879, the Kovler Seal Pool is one of oldest and most popular exhibits at Lincoln Park Zoo, and remains a favorite among zoo guests. The exhibit was renovated most recently in May 1999 in hopes of creating a habitat that most resembles