Fly Butterfly - Penguin Core Concepts Author:Bonnie Bader Exposing children to a diverse range of literary and informational texts, the Core Concepts program helps develop important literacy and cognitive skills necessary to meet many of the Common Core State Standards. — Did you know that every year hundreds of thousands of monarch butterflies migrate 2,500 miles to Mexico for the winter? It takes four... more » generations of butterflies to make the trip, and only the fourth generation lives longer than three weeks. Follow a beautiful butterfly as she makes her journey down to Mexico!« less