By Deborah Freedman, Author & Illustrator. Carl is an earthworm. He spends his days happily tunneling in the soil until a field mouse asks him a simple question that stops him short: Why? Carls quest takes him on an adventure to meet all the animals of the forest, each of whom seems to know exactly what they were put on this earth to do, unlike the curious Carl. But its not until the world around him has changed that Carl begins to realize everyone, no matter how small, makes a big difference just by being themselves. For ages 3 and up.