Mrs. Millie is really silly. She loves to substitute animal words for other words when talking to her kindergarten class. On a class trip to Philadelphia, the kids board a "platypus" (school bus), "hold hens with their buddies" (hold hands with their buddies), and visit the "Liberty Bull" (Liberty Bell). The students love to laugh and correct their favorite teacher. What fun! Joe Mathieu's colored pencil, pen, and ink artwork literally interprets each of Mrs. Millie's "mistakes" and adds hilarity to this lighthearted read-aloud about the city of brotherly love.