I was thinking the other day about how, at zoos, generally most of their animals are on-exhibit for public viewing. But occasionally, there are zoo animals that are kept behind-the-scenes and off-exhibit for a variety of reasons. Lincoln Park Zoo, for example, has an entire chimpanzee troop that lives off-exhibit. Most of the chimps in that troop were raised in atypical environments (Cookie was born in a lab and lived for several years at a private zoo where the owners walked her on a leash like a dog; brothers Zachary and Patrick spent much of their lives in an unaccredited zoo). Sisters Magadi and Kibali were actually both born at Lincoln Park Zoo. Kibali is the oldest chimp at Lincoln Park Zoo; she will turn 41 in August. She's the last surviving member of the zoo's geriatric chimp troop, which included now-deceased Keo and Vicky. Magadi was hand-raised by keepers and later lived at the Henry Vilas Zoo. The zoo is actually in the process of introducing the chimps to the on-exhibit troop and they're hoping the two will bond enough where some of the off-exhibit chimps can spend some time on-exhibit. Are there any other known zoo animals that are living off-exhibit?