How does a caterpillar become a butterfly? Open out the petal-shaped pages, one by one, and watch a transformation unfold. First there's a tiny egg on a leaf, then a caterpillar hatching, just big enough to see. Look at the caterpillar munching away, growing and shedding layers of skin so it can grow some more. Follow as it spins a thread into a green and golden chrysalis, hanging in the sun. Are you ready to see a glorious transformation...