In 1996, a 3-year-old boy climbed a barrier at Brookfield Zoo and fell 24 feet into the gorilla enclosure. He was unconscious. An 8-year-old gorilla named Binti Jua picked him up, cradled him against her body, and carried him to the enclosure door where keepers could reach him. Her own 17-month-old baby, Koola, clung to her back the entire time. The boy spent four days in hospital and made a full recovery. Binti Jua is still alive at Brookfield Zoo — now a grandmother.