When Caterpillar joins Fiona and her friends in their theater project, the other creatures tease him mercilessly. Little do they know what will happen when Caterpillar withdraws into his green and gold chrysalis. Will he come out in time or will their play be ruined? This story is followed by facts about monarch butterflies and how we can help them survive. It would be a great addition to a classroom unit on butterflies and insects. Fun as a homeschooling lesson, too. Grades 2 to 4. Caterpillar's Surprise is the second book in the Fiona the Theater Mouse series.