Little Critter and Gabby befriend a caterpillar. They name him Sam and take care of him until, one day, Sam builds a cocoon and turns into a beautiful butterfly.Young Readers will enjoy these simple and engaging stories written with their reading level in mind. Featuring Mercer Mayer"s charming illustrations and favorite Little Critter characters, children will want to open these books again and again. To ensure reading success, the First Readers were based on McGraw-Hill"s respected educational SRA Open Court Reading Program.Skills activities in the back of the book also help reinforce learning, and a word list is included for vocabulary practice.