The Quahog Zoo is where the Griffins went on a day out in "Screwed the Pooch".

Ignoring Lois' instructions for an orderly tour, the rest of the family splits up by evading her with smoke bombs. Brian loads Stewie's pants pockets with food in the petting zoo until the animals chase him. Peter decides to try to crawl into a kangaroo's pouch where the thing drops from exhaustion from carrying him.