The swan quartet led to Bushman the gorilla (now preserved at the Field Museum) and King the baby rhino (now an adolescent moved to nearby Brookfield Zoo). To legendary mid-century zoo directors Marlin Perkins and Dr. Lester Fisher. To untold thousands of creatures, from mynah birds to dromedary camels, from sea lions to actual lions, bringing touches of the exotic to the Middle West. And to popular features that have come and gone: Captive elephants and chimps that visitors could join at a tea party brought smiles in their day but would merit cringes now, while the zoo has retired two kinds of boat, a replica Viking ship that is now in a park on the Fox River, and those popular and garish paddleboats that plied the waters of the zoo’s South Pond, now remade as the center of an urban wildlife oasis, the Nature Boardwalk footpath.