Robert N Munsch

"Stephanie and Sean's class goes on a trip to the museum, where they get to watch baby chickens hatching. That gets them wondering what might be hatching out of the bigger eggs nearby. Then they ask the museum guide to show them the biggest egg in the museum. When they find it, they see that whatever was inside has already hatched, so the kids decide to have a little fun and hatch a scheme to prank the rest of the class."--