5 - 7 years. In this book children will witness the magical transformation as a newly hatched caterpillar becomes a beautiful Red Admiral Butterfly. For children who are just beginning to read and who have a limited vocabulary, these Level 1 books--about everything from tadpoles to puppies--use word repetition and simple sentences to convey meaning. Picture dictionary boxes with word labels "show" the meanings of words. These books contain between 400 and 450 words each, and they are 80 percent pictures and 20 percent text. Paperback. 32 pages.