What starts as an egg, then walks on many legs, and then uses wings to fly? A butterfly! This Level 1 Reader gives kids an up-close look at exactly how a caterpillar becomes a butterfly. With bonus information including different types of butterflies and poisonous caterpillars, this reader is one of a kind. This high-interest, educationally vetted series of beginning readers features the magnificent images of National Geographic, accompanied by texts written by experienced, skilled children's book authors.